Obsolete
Product - No Longer Supported
The CES Model
HDI-68 is a microprocessor controlled commercial-quality telephone interconnect device
designed for use in radio systems in which a closed repeater (full duplex radio that can
transmit and receive at
the same time on two different frequencies) is the base, and the portable and mobile
radios are semi-
duplex (transmit and receive on two different frequencies one at a time). Released
originally in 1992, the
HDI-68 is currently in use in thousands of applications worldwide and has time and again
proven itself to
be a durable and dependable device and an excellent value. The HDI-68 is electrically the
twin of the
CES Model SSI-68, which is a dedicated Simplex interconnect. The HDI-68 and the SSI-68 can
be
converted to one another by purchasing an EEPROM from CES programmed with the appropriate
firmware. As of January, 1997 the SSI-68 is a current product and is available directly
from CES or
widely through worldwide distribution.
The information that follows is key installation, programming and maintenance
information.
Note: Charts, tables and figures referenced throughout the following sections are
placed at the end of this information.
GENERAL INFORMATION
1.1 Topics Covered by this Manual
This manual provides information regarding the installation, programming, operation,
and maintenance of the CES Model HDI-68 Half-Duplex Interconnect.
1.2 Equipment Description
The Model HDI-68 is designed specifically for land mobile two-way radio applications. The
HDI-68 is controlled by DTMF (Dual Tone Multi-Frequency) audio from mobiles and landline
users, and contains exclusive interface circuitry and operating software that allows for operation
with a wide range of radio equipment and telephone systems.
The HDI-68 incorporates many features including:
* User programmable Access and Disconnect codes (up to 8-digits, including * and # characters)
* User programmable Toll Restriction and Toll Restriction Override codes
* Provuision for selectively enabling or disabling call to 911 emergency services
* User programmable CW Identifier with selectable ID speed and method (may be programmed
to conform with most Amateur or commercial ID regulations)
* User programmable dialing modes, including regenerated DTMF and pulse dialing
* User selectable reverse interconnect operation, including remote programming, VOX-
controlled Remote Base operation, or ringout to mobile stations (including DTMF Selective
Ringout)
* Line In Use detection with busy signal for mobile user
* Line In Use override code for emergencies
* Switch selectable Compression Amplifier for improved telephone line to transmitter audio
* Provisions for operation with CTCSS and Digital Squelch systems
* User programmable Call Limit and Mobile Activity Timers
* Call Limit timer reset code (allows for call time extensions)
* Hook-Flash feature for use with Call-Waiting© services
* Programmable busy channel lockout
* User selectable level setup commands allow for faster service and installation
* Provisions for operation with receivers providing TTL compatable Carrier Operated Squelch
outputs (including AM systems with TTL compatable carrier detection logic outputs)
* 6-pin modular RJ-11 and 1/8" jacks on rear panel allow programming with either CES Model
340P DTMF keypad or standard DTMF (Touch-Tone©) telephone (not supplied with unit)
* Single command default programming allows for easier installation
* Lightning protection networks on telephone line and DC power inputs, and RFI suppression
networks on all significant input and output lines
* 25-pin "D" connector on rear panel for easy flexibility on installation and configuration
* EEPROM memory retains all user programmed information eliminates battery backup
* High intensity LED indicators on front panel for DC Power, Mobile Detection, DTMF
Detection, Transmitter PTT, and Telephone Line Connection
* Powerful high-speed CMOS single-chip microcomputer with 8K ROM operating program and
built-in watchdog timer allow for reliable intelligent operation
* Sturdy commercial quality metal case with grounding stud
* Full One-Year Limited Warranty on parts and labor
1.3 Specifications
1.3.1
Electrical
Power Requirements: +10.0 to +16.0 VDC @ 300 mA maximum (90 mA
standby)
Transmit Audio output level: Adjustable from 5 mV to 2.5 mVpp (in two ranges)
Transmit Audio output Impedance: Switch selectable 600 W or 10K W
Receive Audio level requirements: 50 mV to 10 mVpp (in two ranges)
Receive Audio input Impedance: Greater than 50K W (DC-500 Khz)
Interconnect Frequency Response: 300 Hz to 2.7 Khz (±3dB within this range)
PTT Output (NPN open collector): 100 mA maximum @ 12 VDC
PTT Relay Output: 1 Ampere maximum @ 30 VDC
1.3.2 Mechanical
Size: 6.2"W x 1.5"H x 8.6"D (15.8 cm W x 2.8 cm H x 22 cm D)
Weight: 2.5 lb (1.1 Kg)
1.3.3 Environmental
Operating Temperature Range: -10° to +55° C (14° to 131° F)
Storage Temperature Range: -40° to +70° C (-40° to 158° F)
Humidity Limitations: 0 to 90% (non-condensing)
2 INSTALLATION INSTRUCTIONS
2.1 General Information
The instructions included in this manual for installation of the HDI-68 assume that the person
accomplishing the installation is either familiar with the radio equipment to be interfaced, or
has the ability to understand the functional requirements of the HDI-68 interface (power supply,
grounding system, transmitter and receiver functions). The information provided in this manual
do include a 'basic' installation outline and a block diagram to illustrate a straightforward
approach to performing an installation with a transmitter and receiver combination or repeater
equipment. The "Quick Installation Instructions" section 2.12 in this manual describes the
installation procedures for usual applications.
2.2 Radio Equipment Requirements
The HDI-68 is intended to operate with most repeater equipment, or separate receiver and
transmitter combinations for a Full-Duplex mode of operation. The equipment should be verified
to be in good working order (receiver sensitivity, transmitter modulation, power output, etc) prior
to attempting installation of the HDI-68. The transmitter modulation should be set to, or just
under, 5.0 KHz deviation. In systems where modulation is limited to 3.5 KHz, then verify that
the deviation is set to 2.5 KHz.
2.3 Materials and Equipment Required for Installation
The following items are needed for proper installation of the HDI-68:
#2 Phillips Screwdriver
1/8" flat blade adjustment tool or screwdriver
Soldering Iron and solder
Communications Service Monitor (preferred), or modulation deviation meter
Digital Multimeter
Oscilloscope
Radio Transceiver (in addition to the equipment to be installed with the HDI-68)
2.4 Mechanical Installation
There are no special requirements for mechanical installation of the HDI-68 other than placement
adjacent to the repeater or transmitter/receiver equipment it is to be installed with. The HDI-68
should be located close to a good grounding system for best lightning protection. As with any
electronic equipment, the HDI-68 should be installed in a relatively dust-free and temperature and
humidity-controlled environment for the best possible life of the equipment.
2.5 Electrical Installation
Electrical installation of the HDI-68 involves connection to the repeater or transmitter and
receiver with the supplied interface cable and to the telephone line with the supplied modular
cord. Table 2.5.1 provides functional information for each connection available from J4 on the
rear panel of the HDI-68 and the interface cable.
If this is the first experience with installing the HDI-68, then it is recommended that the entire
installation section be reviewed first before proceeding with the actual electrical installation and
connections. In particular, notice that connections for a minimal, basic, or standard installation is
outlined in Table 2.5.1 that follows and that the required connections are printed in bold. The basic
installation is recommended and may be supplemented with other connections, such as a logic output from
a CTCSS decoder.
One of the most significant difficulties many customers have with installing the HDI-68
interconnect is determining a source for Receiver Audio. It is recommended that FM detector
audio that has not been conditioned by de-emphasis, not squelched (always present, even though
the receiver squelch control is set to squelched), and is not controlled by the receiver volume
control. In using this method, the internal HDI-68 carrier detection circuitry can be used and
simplifying installation. For more information concerning connection to the FM detector
circuitry, see this section in the Appendix of this manual.
2.5 Electrical Installation - continued
Description of Connections
The functional topics depicted in bold within this section are required minimum connections for
a typical or standard installation. Other topics not in bold are optional input or output functions.
GROUND (System) - This ground connection is made at the threaded stud located on the rear
panel of the HDI-68, and should be connected to a good earth ground shared by the repeater
equipment.
GROUND (Shield - Pin 1) - Connect the shield conductor of the supplied cable to a common
ground point that serves in the repeater or transmitter and receiver as: Power Supply Ground (A-),
Audio Ground, and PTT Ground.
+12 VDC (Red - Pin 13) - This is a power supply input to the HDI-68 requiring a filtered and
regulated source between +10 and +16 volts DC. It is recommended to verify with an
oscilloscope or AC voltmeter that the +12 VDC power supply intended for use as a source for the
HDI-68 and shared with the repeater or transmitter and receiver combination does not contain AC
ripple (hum) that exceeds approximately 100 mV when the transmitter is transmitting. Some
repeater equipment may have two separate +12VDC sources: one for the transmitter power
amplifier and another for the lower level stages. If this is the case, use the power supply source
that is normally used by the lower level stages.
Transmitter Audio Input (Orange - Pin 14) This is telephone line audio output to the
transmitter from the HDI-68 that includes courtesy and ringout tones. Make this connection to the
transmitter microphone input, transmitter audio line input, or other modulator input that will
incorporate pre-emphasis before being transmitted..
Receiver Audio Input (Yellow - Pin 24) Preferred Method: This input to the HDI-68 should be
connected directly to the receiver FM detector (discriminator, ratio detector, or other similar).
For additional assistance in locating this point, refer to Appendix A of the manual. In some cases,
it may be appropriate to install an suitable connector on the repeater or receiver wired to the
FM detector for connection to the HDI-68. With this method of using FM detector audio, the internal
HDI-68 carrier detection circuitry will be utilized, minimizing the number of connections to the repeater
equipment.
Alternate Method: If a direct connection to the FM detector is not desired, or if it is difficult
to accomplish this method, then connect Receiver Audio Input to another point in the receiver
where audio is: Squelched when not receiving a carrier
Not affected by the receiver volume control (see note below)
If the point selected does not have de-emphasized audio (high frequency detector noise filtered
out), then verify that JPR2 is installed. If the connection point does have high-frequency noise
filtered out, then remove JPR2.
Note: The connection may be made to the speaker, but in doing so will require that the receiver
volume control be preset and left at a fixed level once the HDI-68 adjustments have been
performed. Subsequently changing the volume control level may result in difficulty in operation
of the interconnect. A preferred connection point would be at the 'top' of the volume control,
where the volume control will not affect the audio level input to the HDI-68.
In using this alternate method, the External COR Input must be connected, covered on the
following page.
2.5 Electrical Installation - continued
Description of Connections
PTT Open Collector Output (Brown - Pin 20) Connect this wire to microphone PTT or
transmitter PTT, as appropriate; unless the transmitter push-to-talk logic requirement is non-
standard (active low to ground for transmit) or requires switching in accordance with the PTT
Relay Connections paragraph that follows.
PTT Relay Connections (Blue - Pin 21, Green - Pin 10, no existing wire - Pin 9) This optional
connection may be used when the transmitter push-to-talk control requirement is different than a
normal 100 mA open-collector active low output as otherwise provided at Pin 20. This function
must be used when the transmitter PTT circuit requires a higher than normal current pull to
ground, a source voltage that exceeds 12VDC, or requires a switched voltage to key the
transmitter. Dated equipment, such as vacuum tube type of transmitters will require the use of the
HDI-68 PTT relay control. The HDI-68 internal relay connections are: J4 Pin 21 is relay
common, J4 Pin 10 is normally open, and J4 Pin 9. Suggestion: If using Pin 9, move the Green
wire to Pin 9 and note the change in for your future reference.
External COR (Violet - Pin 2) This input is not required if Receiver Audio was obtained directly
at the FM detector. If using this function, connect to a point in the receiver squelch circuit that
changes logic state when the receiver is squelched and unsquelched. This may either be an active
high state (5-volts or greater) or and active low state (0-volts) when a carrier is being received.
Use an oscilloscope or multimeter to verify this function. In some receivers this connection point
may be at the output of a noise detector circuit or in some cases available at a pin of the FM
detector IC or a an external switching transistor. If the unsquelched state is an active high switch
S3-E is set to ON, or if the unsquelched state is an active low, then switch S3-F is set to ON (refer
to Table 2.6.1 for further instructions in setting these switches). The HDI-68 will also allow for
an open-collector output as it internally has a 100K ohm pull-up resistor.
Carrier Validation Input (Black - Pin 3) This input is used in conjunction with systems using
CTCSS (Continuous Tone Controlled Squelch Systems) also known as PL©, CG©, and others; or
DCS (digital coded squelch systems) also known as DPL©, DCG©, and others. This logical input
from the receiver CTCSS or DCS decoder circuit must be an active low (0-volts) upon a valid
CTCSS tone or DCS code being received, and a logic high (5-volts) when inactive. If the
particular decoder output is greater than 5-volts (some systems may source 8V, 9.6V, or 12V for
instance) then place an appropriate series current-limiting resistor with a 5.1 volt zener diode to
ground in order to limit this input to the HDI-68 to the 5-volt range. If connecting to an
open-collector output from the decoder, then remove the HDI-68 pull-down 10K resistor (R46) by
cutting one end from the printed circuit board. The HDI-68 has an internal 100K ohm pull-up
resistor (R44) in the event the existing decoder circuit does not have a pull-up resistor.
PL© and DPL© are trademarks of Motorola, Inc.
CG© and DCG© are trademarks of Ericsson-General Electric Co.
External Connect Switch (no existing wire - Pin 4) This optional input may be used in
installations where a remote control receiver is used, or where an external (to the HDI-68) Local
Connect switch is to be incorporated on a dispatch console. To use this input, pull it
momentarily to ground to enable a landline to mobile connection. To disconnect, similarly pull
this line ground again to terminate a landline to mobile call. This function could be utilized as a
supervisory control concept in a communications center. If using a control connection that
exceeds 25-feet, incorporate an electronic buffer circuit immediately adjacent to the HDI-68, and
return the ground connection to the HDI-68 ground connection. Also see section 3.4.
Control Receiver Audio Input (no existing wire - Pin 7) This optional input may be used where
an auxillary receiver is used in the system for the purpose of dialing telephone numbers for users
separately from the user-active channel, or for remote programming the HDI-68 on a different
radio channel. This is an input directly into the HDI-68 DTMF decoder and requires
approximately a 1.0 V peak-to-peak DTMF audio level.
2.6 Internal Switch Settings
Table 2.6.1 shows the possible settings for the 8-section DIP switch S3 and the 2-pin header
jumpers JPR1 through JPR3. Note: The "ON" position for JPR1 through JPR3 is when the
jumper is in. Note that the three COR switches (E, F, & G) must be set in accordance with one
configuration only. Switch or Jumper settings in bold are factory default or recommended
settings for most installations:
Table 2.6.1
2.7 Audio and Threshold Level Setting Proceedures
Initial setup of many of the adjustments in the HDI-68 has already been accomplished at the
factory. However, transmitter and receiver audio levels will likely have to be adjusted for the
particular equipment the HDI-68 is being installed with. Potentiometers that have a paint dot on
top should not be adjusted unless the applicable function associated with a potentiometer is
determined to be unsuitable upon actually verifying operation when the HDI-68 has been placed
into service and operationally tested.
Audio and Threshold Level Setting Proceedures - continued
2.7.1 How to Enter the Program/Setup Mode
In order to provide for easy installation, a number of level setting commands have been made
available in the HDI-68 Program/Setup mode. To enter the Program/Setup mode:
1. Connect an RF dummy load to the transmitter antenna port (recommended). Set the
communications service monitor to the transmitter frequency, or use a monitor receiver, to
hear the acknowledgement or prompt tones generated by the HDI-68.
2. Plug a DTMF telephone into J2 or plug a CES 340P handheld programmer into J3 (do not
use both at the same time).
3. Turn OFF the HDI-68 power switch by placing the front panel POWER switch in the OUT
position.
4. Press and hold the front panel CONNECT switch IN and turn on the HDI-68 Power switch
by pressing it to the IN position. Release the CONNECT switch. A series of three prompt
tones should be heard from the communications service monitor speaker, confirming
successful entry into the Program/Setup mode. The HDI-68 will remain in the Program/
Setup mode until:
a. The power is turned off.
b. The "01#" command is entered from the programming telephone.
c. Program mode timer expires (10-minutes upon no DTMF key entry)
2.7.2 Entering Programming Commands
Programming commands are entered by pressing the appropriate keys (0 - 9, "*",
and "#" only) on
the programming telephone or 340P programmer. Each command is a sequence of two digits
followed by a "#". Once a valid command has been entered, a single prompt tone, or a series of
three prompt tones (depending on the command entered) will be heard on the service monitor. If
a mistake is made when entering a command sequence, simply press and release the "#" key
slowly until a response of three prompt tones is heard, and then re-enter the desired command.
After three prompt tones are heard, the HDI-68 is ready for another command. Upon a single
prompt being heard, the HDI-68 is waiting for a parameter for the particular command entered.
When all programming is done, enter "01#" to exit the Program/Setup mode. A series of
plus an additional will be heard, comfirming that the HDI-68
has exited the Program/Setup mode and is now in the normal operating mode.
Additional Programming notes:
(1) It is helpful to monitor the transmitter output while in the program/setup mode to hear
the that are generated by the HDI-68, indicating the progress of the
programming entries.
(2) After a valid command entry [2-digits + #] a will be heard.
(3) After a valid parameter entry [1 or more digits] (if entering fewer than the maximum
number of digits allowed, terminate the entry with a "#") a will be
heard.
(4) If an invalid entry is made, an (series of low tones) will be heard.
2.7.3 Adjustment Procedures
Use the following procedures to adjust levels at inital installation or for subsequent desired
re-adjustment by placing the HDI-68 in the Program/Setup mode:
* ID/Ringout Tone Level Adjustment
Enter the command "55#" to send a single tone to the transmitter. Using the
communications service monitor, set potentiometer RV4 for approximately 2.5 KHz
deviation. If RV4 does not provide enough adjustment range, then set switch S3-C and/or
jumper JPR3 to increase or decrease the output level. After adjustment is completed, press
the "#" key to exit this Setup command level.
Audio and Threshold Level Setting Proceedures - continued
* Telephone Line to Transmitter Audio Level
Temporarily remove jumper JPR1. Enter command "50#" to complete the audio path
between the telephone line and the transmitter. Adjust RV3 for approximately 80%
deviation of dial tone audio, as observed on the service monitor.
Reinstall jumper JPR1.
Enter "#" to exit this Setup command level.
This command level may also be adjusted as an alternate method:
1. Disconnect the telephone line from J1 and place the HDI-68 in the Program/Setup
mode.
2. Enter command "50#" and call the interconnect telephone line from another telephone.
Answer the call by plugging the telephone line into J1.
3. Have the calling party speak in an above-average voice and adjust RV3 from a full
counterclockwise position slowly clockwise until the observed modulation on the
service monitor just reaches modulation limiting (clipped). If the service monitor used
does not have a built-in oscilloscope, then connect an oscilloscope to the "DEMOD"
output of the service monitor to make this adjustment.
4. When the adjustment is completed, enter "#" to exit this command level and to
disconnect the line.
Note for Speaker Audio (non-Discriminator Audio) installations:
Place the receiver volume control approximately 1/3 clockwise and mark the physical position.
This type of installation requires that a constant receiver audio level be always present to the
HDI-68 interconnect. Verify that Jumper JPR2 is removed.
* Receiver to Telephone Line Level and Carrier Detect Adjustment
This section involves RV9 (Carrier Detect) and RV8 for proper Receiver to Telephone Line
Audio level:
Note - The adjustment of RV9 may be ignored if not using Discriminator Audio, and using speaker
or other squelched audio in conjunction with an External COR input.
1. Rotate RV8 and RV9 to the fully counterclockwise position (CCW).
2. Preferred Method: Adjust RV9 clockwise just far enough to extinguish the "Mobile
Detect" LED DS2 (located on the HDI-68 printed circuit board) without any flicker. If the
adjustment range is too low, then place switch S3-D to the "ON" position. If the adjustment
range is too high, then place S3-D to the "OFF" position. Plug a local telephone into J1.
Connect the service monitor to the receiver and set it to generate an
on-channel unmodulated full-quieting signal. Now slowly reduce the generator output
until an approximate 10-dB (signal-to-noise ratio) is heard on the local telephone.
Verify that reducing the generator output just below this point results in LED DS2
becoming extinguished (not illuminated). If not, then adjust RV9 so that it becomes
illuminated above a 10-dB signal-to-noise signal (normally 0.3 to 0.35 uV receiver
input) and extinguished when the generated signal is below this point. Unplug the local
telephone from J1 and plug the telephone line into J1.
Alternate Method: Adjust RV9 clockwise just far enough to extinguish the "Mobile
Detect" LED DS2 without any flicker. If the adjustment range is too low, then place
switch S3-D to the "ON" position. If the adjustment range is too high, then place S3-D
to the "OFF" position. Readjust RV9 as necessary with a weak (noisy) signal received
from a mobile. Verify that the LED DS2 is not illuminated, or flickers, when a mobile
is not transmitting.
Audio and Threshold Level Setting Proceedures
Ø Receiver to Telephone Line Level and Carrier Detect Adjustment - continued
3. Place the HDI-68 into the Program/Setup mode and enter command "51#" to turn on the
receiver to telephone line audio path. With the service monitor, generate an on-channel
full-quieting signal modulated with a 1 KHz tone set to 3.0 KHz deviation. Adjust RV8
for 1.5 volts peak-to-peak as measured at test point TP1 with an oscilloscope. If using
an AC millivoltmeter, set RV8 for 540 mV rms at TP1. This is a preferred method. If
a service monitor is not available, then use the following alternate method.
Alternate Method: Remove JPR2. Place the HDI-68 in the Program/Setup mode and
enter command "51#". Set RV8 for 2.0 volts peak-to-peak as measured at TP1 with an
oscilloscope. Reinstall JPR2.
4. Enter "#" to exit this command level and to disconnect the telephone line.
Ø Mobile DTMF Sensitivity Adjustment
This adjustment must be made for reliable DTMF tone decoding from a mobile.
1. Enter the Program/Setup mode by entering command "52#".
2. Have a mobile press and hold a DTMF digit, and adjust RV10 clockwise from it's fully
counterclockwise rotation, so that the front panel "DTMF" LED is ON or illuminated.
The mobile DTMF encoding should be known to be properly set for 2/3 DTMF
modulation with reference to a maximum 5 KHz deviation.
3. Now adjust RV10 clockwise approximately 1/8 of a full turn past the point where the
DTMF LED became illuminated.
4. Since this test mode causes the HDI-68 DTMF decoder to become 'swamped' with
receiver noise and otherwise impairing decoding from the DTMF test telephone or
340P handheld programmer, exit the Program/Setup mode by turning off power to the
HDI-68 with the front panel Power switch.
2.8 Interconnect Programming Configuration
2.8.1 General Information
The HDI-68 may be configured to operate in a number of different methods, depending upon the
user requirements. Before attempting to further configure the HDI-68 for operational features,
decide on the following:
1. Will the HDI-68 be answering incoming calls? If so, after how many rings?
2. Do the users of the interconnect want incoming telephone calls to be automatically
forwarded and to alert the mobiles?
3. What are the CWID (Morse code station identification) requirements for the system
being installed?
4. What telephone numbers are to be Toll-Restricted?
5. Should the Mobile Connect Code users (low-level or secondary users) be allowed to
dial 911?
Reprogramming or the changing of any operational parameter of the HDI-68 may be done at any
time.
2.8.2 Using the Factory Default Configuration
This feature of the HDI-68 permits the installing technician to get the interconnect into
operation with least amount of effort. In addition, if provides the ability to return to a
known starting point in the event unusual difficulty is experienced in programming, or if a
number of programming changes are made but not known. Although the factory default configuration
is designed to accomodate most installations, it is suggested that the installer view each command
factory default parameter. If any parameter is not set to the desired operation, then make the
appropriate changes in the Program/Setup mode.
Enter the Program/Setup Mode: Press and hold the front panel CONNECT switch IN and turn on
the HDI-68 Power switch by pressing it to the IN position. Release the CONNECT switch.
Enter command "00#" from the DTMF test telephone (plugged into J2), or the 340P handheld
programmer. will be heard on the service monitor to indicate that
initialization to factory defaults has been completed.
Continue with programming the various command levels with parameter changes for the desired
functions. If you are not sure about a particular feature or function, then operationally
try the factory default first. Any feature or function may be changed at any time.
2.8.3 Dialing Mode Selection
The method of dialing the phone line may be changed by using the "24#" command. The choices
available include both regenerative and nonregenerative DTMF dialing, U.S.A. Pulse Dialing, and
European method of pulse dialing. The Regenerated DTMF mode is the default mode and is the
preferred mode of operation with the HDI-68. To change the Dialing Mode:
1. Enter the program/setup mode.
2. Enter the "24#" command and wait for a .
3. Enter ONE of the following choices for a dialing mode:
Note: The term pps = pulses per second
2.8.4 Landline to Mobile Signalling Options
The HDI-68 may be programmed to handle incoming calls from the landline in several ways. In
addition, when the call is answered, there are a number of options which may be placed on the
way that the call is handled, and on what choices of operation are available to a caller with
the proper codes. In the default configuration, the HDI-68 automatically answers the call
at the end of the 2nd ring. This may or may not be the desired configuration, especially on a shared
telephone line.
In changing this feature, the first choice that must be made (as mentioned previously in section
2.8.1) is how to respond to an incoming call (or what to do if the line is ringing). The
available choices are:
2.8.4 Landline to Mobile Signalling Options - continued
A second command entry must be made if the HDI-68 is configured to automatically answer a
call, where the number of rings on which to answer is programmed:
A further choice is whether to automatically ring out to the mobile, or answer the line and wait for
a request for an alternate mode from the landline caller. This feature is controlled by the
Ringout Security Code "05#" command. To disable this feature (already disabled as a
factory default), enter "05#", wait for a and enter another
"#", where will confirm acceptance of the command. To enable
the feature, program a Ringout Security
Code [example: code "688"]:
With the above code entered into the HDI-68, landline callers desiring to ring a mobile(s) must
enter "688" on a DTMF telephone immediately after the HDI-68 answers the line with a single
prompt tone.
When configured to automatically answer the phone line, the caller is given a choice (after a
prompting tone from the interconnect) of entering one of serveral other modes not yet described.
The first mode, enabled by dialing a code that has been programmed under command "08#"
allows the use of the HDI-68 as a Remote Base Station. The second mode, enabled by dialing a
code that has been programmed with command "09" allows the user to remotely program the
HDI-68. This operation is similar to the local programming mode as described in sections 2.7.1
and 2.7.2, except that the setup mode is not allowed (commands 50# through 55#).
The remaining mode, enabled by dialing a code that has been programmed with the command
"10#" plus an additional string of numbers (up to 6-digits), allows the user to
selectively page (or
call) a mobile that is equipped with a DTMF selective call decoder. Refer to section 3.3.3 for
more information on how to use these features, and sections 2.9.4 through 2.9.7 for information
on programming the required codes.
2.8.5 Setting Up Toll Restriction
One of the more powerful features of the HDI-68 is the ability to restrict mobiles from dialing
long distance (toll) calls. You may place up to four restrictions on both the first and second
digits dialed. If it is desired to restrict all long distance calls, the digits 1 and 0 should
be placed on boththe first and second digit "restriction lists" (set up with the "21#"
and "22#" commands). With the 1 and 0 digits restricted in this manner, a mobile
attempting to dial an operator for assistance (0), a station-to-station call (1-xxx-xxxx),
or an operator-assisted call (1-0-xxx-xxxx) will be disconnected and the call will not go through.
You may also restrict calls to particular local (PBX) exchanges or other types of toll calls
(such as information or time).
In order to provide the HDI-68 user with maximum flexibility, a means of bypassing toll
restriction has been provided in the form of a Toll Restriction Override Code. System owners
may issue this code to select users who have a need to make toll calls. This code is used in
place of the standard mobile connect code (see section 3.2.3 for more information on this feature).
The code may easily be changed if it becomes known to unauthorized users.
In many instances it will be desired to have Mobile Connect Code users be unrestricted from
dialling 911, even though the toll restriction 'lists' contain 9 or 1 in th first and second digit
positions, respectively. In these cases, the toll restriction for 911 may be disabled by entering
the sequence "23#" and then a "1".
2.8.6 Call Limit Timer
The Call Limit Timer controls the maximum interconnected call length. This timer is set to a
length of time long enough to allwo for a normal call and short enough to insure that all users are
given a fair chance to use the interconnect. The timer initiates a series of warning tones at
intervals of 10-seconds beginning 30-seconds before the call is automatically terminated.
To set the Call Limit Timer:
The Call Limit Timer can be reset during a call by using the Reset Call Limit Timer Code (see
section 2.9.8 for more information on using this code).
2.8.7 Mobile Activity Timer
The Mobile Activity Timer automatically disconnects the telephone line (hangs up) if a mobile
drives out of range during a call, the mobile user fails to properly terminate the call, or if the
mobile otherwise abandons the call. This timer (set in 30-second increments) terminates a call
whenever a mobile transmission is not detected within the prescribed time period. The HDI-68
will send a single warning tone 15 seconds prior to automatic disconnect. To reset the timer, the
mobile need only to transmit carrier briefly. In addition, this timer is used in Remote Base
Operation to disconnect the phone line in the event that the caller forgets to send the "#"
disconnect command after using this feature (refer to section 3.3.2 for more information on
Remote Base Operation).
If the Mobile Activity Timer setting is too short, the mobile may get disconnected inadvertently
because it has not transmitted frequently enough, although transmit periods may be considered
normal. On the other hand, if the value is too long, the telephone interconnection may be
occasionally left hanging off-hook for unnecessary periods of time due to a mobile user not
properly terminating the call. We recommend the factory default setting of 1-minute.
To change the Mobile Activity Timer:
(An entry of <2> will result in a timer length of 1-minute)
2.8.8 Enabling Automatic CW Identification (CWID)
CWID is used for station identification as may be required by national or international law or
regulation. The method of sending the CWID station call sign is different for various classes of
stations encountered worldwide. The HDI-68 can be programmed to identify in accordance with
virtually all of these methods:
The speed or Morse code rate in words-per-minute is set as follows: See Chart at End
2.8.9 Programming the Station Call Sign
The station call sign is programmed by entering a 2-digit code for each alpha character or number
from Table 2.8.12, while in the program/setup mode. The command sequence is as follows:
Example: A station call sign of WXX24 would be programmed as follows:
Table 2.8.12 CWID Character Codes
2.8.10 Courtesty Beep
The courtesty beep, when enabled, will provide an audible short tone to the telephone line each
time the mobile stops transmitting to indicate to the landline party that they may begin to talk.
To enable or disable the Courtesy Beep feature: See Chart at End
2.8.11 Busy Channel Lockout
Busy Channel Lockout, when enabled, will check for carrier activity on the channel before
answering a landline call and will answer only if there is not activity on the channel. If this
feature is disabled, the interconnect will continue to process the call as normal.
To enable or disable the Busy Channel Lockout feature:
.6 IN CASE OF DIFFICULTY
In this section, one or more suggestions are described in order to resolve the problem. If the first
or next suggestion does not eliminate the difficulty, then proceed with the subsequent item listed
for the problem.
HDI-68 is apparently dead or non-operational
(1) Check internal fuse F1. If open, replace with a 1-ampere fast blow 3AG type.
(2) Verify that the HDI-68 connection to +12VDC is good.
(3) Verify that the HDI-68 has a proper ground connection to the source power supply.
(4) Enter the Program/Setup mode (Power up with Connect switch depressed) and re-initialize
to factory defaults. Program other parameters in accordance with your requirements for
this installation.
Upon installation and configuration HDI-68 does not acknowledge mobile
(1) If using Discriminator Audio from the receiver, verify that jumper JPR2 is removed, and
that LED DS2 is illuminated when a mobile is transmitting and off when not transmitting.
Verify that DIP switch S3-E, S3-F, and S3-G are correctly configured for the HDI-68
Internal Mobile Detector.
(2) If using External COR input, verify that DIP switch S3-E, S3-F, and S3-G are correctly
configured for external COR and the proper active level (high or low) upon receipt of
carrier. Verify that this active logic level is present on the interconnect cable Violet wire.
HDI-68 not responding to telephone line ringing
(1) Verify that the Ring Counter parameter is not set longer than desired. Enter the Program/
Setup mode and set command 13# to the for the number of rings for the HDI-68 to wait until
answering (1-9 Rings).
(2) Troubleshoot the Ring Detector by connecting an oscilloscope to R6-5 and adjust RV6 for a
12-17 msec negative-going pulse width at the 1V level during ringing. Make this
measurement with the vertical mode set to DC and the horizontal mode at 5 msec/div, or
adjust RV6 in very small increments (10° or less) to either side of the factory set position
(clockwise for greater sensitivity) until proper operation is achieved.
Line In Use detector not operational
(1) Connect a 2 to 1 line "Y" adapter to J1 on the rear of the HDI-68 and connect a local
telephone to one port and the telephone line to the other jack.
(2) Connect an oscilloscope (set to DC and 1 or 2 volts per division) to U5 pin 7.
(3) Press and release the front panel CONNECT switch. While intermittently pressing the
telephone hook switch on and off at a rate of approximately once every second, adjust the
Line In Use detector potentiometer RV7 to the center of a narrow range (usually about 10° of
rotation) where the oscilloscope display toggles between 0 VDC and 5VDC as the telephone
hook switch is pressed and released.
(4) If the detector is impossible to adjust due to a very low loop current, then disable the Line In
Use circuit by entering the Program/Setup mode and programming command "07#" for
parameter "#" (disabled).
Programming notes:
(1) It is helpful to monitor the transmitter output while in the program/setup mode to hear
the that are generated by the HDI-68, indicating the progress of the
programming entries.
(2) After a valid command entry [2-digits + #] a will be heard.
(3) After a valid parameter entry [1 or more digits] (if entering fewer than the maximum
number of digits allowed, terminate the entry with a "#") a will be
heard.
(4) If an invalid entry is made, an (series of low tones) will be heard.
Appendix A
How To Locate Discriminator or FM Detector Audio
Most receivers used in conjunction with CES Simplex Interconnects will likely have an integrated
circuit FM detector, where the detected audio will appear on one pin of the IC.
This pin will normally exit to the receiver's squelch circuit (sometimes part of the same IC) and
to an audio amplifier incorporating de-emphasis (removes the high-frequency noise components) and/
or and audio switch controlled by the squelch circuitry. In interfacing to an interconnect, several
factors should be considered: (1) That connecting any external circuit to the IC does not load or
affect it's operating characteristics, and (2) that any other external noise or RF is not permitted
to be coupled back into the receiver. Locate the IF/Detector or Detector IC in the radio schematic.
Verify with an oscilloscope that the pin contains both unsquelched high frequency noise (300 mV to
2 V typical) and only detected audio when receiving a modulated carrier. Connect the CES interconnect's
Receiver Audio input to this point and note if the level is affected. If it becomes reduced by
more than 20%, try placing a 10K to 20K resistor in series to minimize any loading. If necessary,
use a higher value resistor. Place heatshrink tubing over the resistor and the connections to
prevent any chance of shorting to surrounding components. If unusual noise is observed either in
the radio speaker or interconnect when either is used, then an RF choke of perhaps 1 mH in series
and at this point of connection may be needed.
The table later in this appendix lists several types of applicable detector IC's. If the IC type
is not listed, and you are unable to determine the proper pin on the detector IC on the radio schematic:
Use an oscilloscope to locate the detected audio output. With no carrier being received, look
for a pin that has high frequency noise (up to approx. 10 KHz or greater), and that has detected
audio when receiving a modulated carrier. The audio level at the correct pin will not be affected
by the receiver squelch control or the volume control. The correct pin will not normally be
connected to a tunable coil, crystal filter, or ceramic resonator.
If the detector IC output pin cannot be determined, then proceed with the following suggestions:
(1) In no case will true FM detector audio be available at the speaker output connection of
the receiver. Similarly, it is unlikely that the desired FM detector audio will be available
at the 'top' of the receiver volume control. The recovered audio at these points will normally
already be de-emphasized and will not include the high-frequency noise components necessary
for most simplex interconnects to operate in this mode.
(2) The correct point will be somewhere between the 'top' of the front panel volume control
and the detector IC. Looking at the radio schematic diagram, an FET audio gate may be seen
with its' gate connected to the squelch circuitry. Verify with an oscilloscope that audio
is always present at this point, even when the squelch control is set to squelched (no audio
is heard from the speaker). With an RF signal generator or communications service monitor,
generate a full-quieting on-channel carrier modulated with a 1 KHz tone.
After verifying the presence of the 1 KHz tone, vary the modulated tone upward to 10 KHz.
If the recovered audio signal observed stays at approximately the same level, then make the
discriminator audio connection to this point. If the level drops to a substantial level
below that observed at 1 KHz, such as 30% or less, then move to a point in the schematic
diagram toward the FM detector where the level of noise and recovered audio, including the
10 KHz test, are approximately the same.
Common FM Receiver IC's
*Note: Some of the IC's listed above, in particular those marked with an "*",
may have the detected audio pin squelched when a carrier is not being received. If
this is the case, then the receiver must be left unsquelched at all times, or the
External COR function must be
used.
Table 2.5.1 HDI-68 Radio-Interface Cable and Color Code
Note: The functions in BOLD are minimal or normal connections required for a carrier
squelch repeater or transmitter and receiver combination. Other connections are for
optional functions such as CTCSS Detection Logic from receiver CTCSS decoder output, if used.
J4 Pins 8, 15, 23, and 25 are all spare ground connections. Pins not listed are not connected internally.
Figure 2.5.1 HDI-68 Back Panel Layout
Notes:
(1) For HDI-68 installations using speaker audio, or othe receiver audio other than FM
detector audio, DIP switch S3-E or S3-F should be "ON", and S3-D and S3-G (and
jumper JPR2) should be "OFF". Speaker audio should be squelched when a mobile is not
being received and the receiver COR logic level should be connected to J4-2. See Section
2.3 for information on External COR.
(2) Settings of S3-C, S3-D, and JPR3 may be changed to increase the ranges of RV3 and RV4
(related to S3-C and JPR3), and RV8 (related to S3-D).
(3) S3-H should be placed in the "OFF" position when using the open-collector logic output
for PTT.
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