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Definition: Selcall
Definition: Telcall

DT8R - DTMF controller board (relay)
DT8T - DTMF controller board (transistor)


Operational commands

Below are listed the various operating modes for the DT8 DTMF controller board. If the AUDIO FEEDBACK feature is enabled then the DT8 will produce a PTT signal and acknowledgement or error tones for each DTMF tone or command received. Do NOT enable AUDIO FEEDBACK if you are not going to use this feature as it slows down the operation of the DT8.

The sequence of events for the AUDIO FEEDBACK and PTT is a follows:
1) turn on PTT transistor (open collector)
2) wait 100 milliseconds
3) produce tones
4) wait 50 milliseconds
5) turn off PTT transistor.

Follow Mode

N

N = 1 to 8.
Relay N operates when DTMF tone N is received.
Relay releases when tone disappears.

Pulse Mode

N

N = 1 to 8.
When DTMF tone N is received relay N operates and stays operated for the length of the programmed pulse period.
The pulse period can be extended by resending the tone N. Holding the tone N on for an extended period of time does not affect the pulse period

Latch Mode

N *
N = 1 to 8.
When DTMF tone N is received followed by DTMF * the relay N is operated and stays operated until reset with N #
N #
N = 1 to 8.
When DTMF tone N is received followed by DTMF # the relay N is released and stays released until operated with N *
Note:
Any relay can be programmed to operate on power up or restart

Exclusive Mode

N
N = 1 to 8.
Any or all relays can be in the exclusive list. When tone N is received relay N is operated and all other relays in the exclusive list are released. Only one relay in the exclusive list can be operated at any one time.
Note:

Any relay can be programmed to operate on power up or restart

Set/Reset All

0 * This command sets all relays into the operated condition.
Note: This command can be enabled or disabled by programming.
0 #

This command has four possible operations depending on the DT8 programming.
0) Disabled - command ignored
1) Reset All - command resets all relays to the unoperated condition
2) Soft Restart - command sets all relays to the power up condition
3) Hard Restart - command restarts the DT8 software as a power up reset.

Lock code

*NN# Where NN means between 1 and 8 digits (DTMF numbers 0 to 9, letters A to D)
When the DT8 receives a valid lock code it cannot be activated by any more commands until after it has received a valid unlock code.

Unlock code

#NN#

Where NN means between 1 and 8 digits (DTMF numbers 0 to 9, letters A to D)
This command has three possible operating modes:
1) Normal - After receiving a valid unlock code the DT8 will respond to all further commands.
2) Auto-lock timed - After receiving a valid unlock code the DT8 will respond to all further commands unless the timer period of inactivity is exceeded when the DT8 will not respond to any commands except the unlock command.
3) Auto-lock immediate - After receiving a valid unlock code the DT8 will respond to only one command after which it is automatically locked again.

Access codes

AA Where AA means any two digits (DTMF numbers 0 to 9, letters A to D) followed by any command except Lock or Unlock. Three different access codes are available, Individual, Group or Allcall. Audio Feedback only works with individual addressing mode and then only for command completion.

Click here for the DT8R/DT8T manual



Jenal Communications design and manufacture a wide range of radio related devices including units which use the standard HF selcall and telcall signalling as used by Barrett, Codan, Icom and Q-Mac. Thousands of these products are being used all around the world by Governments, NGOs, Commercial organisations and Amateur Radio operators. We also manufacture a number of devices which use the common DTMF (or touchtone) signalling system.
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Last modified: 23 June 2015.