Service Manual Part 1
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After power-up, a reset command or a hardware reset, the radio sends the logon prompt
character “v”. Replying with an ASCII “%” within 500ms of the prompt will put the
radio in CCTM.
The radio will confirm engagement of CCTM by sending the prompt “-”, preceded by a
“CR”.
If no reply is received within the required period, the radio will engage normal
trunked mode, or MTM if the test link is fitted or the ‘sticky’ MTM is active.
If CCTM is engaged when the test link is fitted, the radio sends an error message and
gives a unique error indication (refer to Table 5.2, “Radio Mode/Status Display”).
While in CCTM, MTM can be selected (refer to Section 5.8.2). This will not come into
effect until after the next power-up or reset. To re-engage CCTM without switching the
radio off then on, a reset command can be sent to reset the radio and restart logon
prompting.
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• The radio accepts commands in any of the following formats:
- A two digit ASCII string selects the corresponding test function.
- A “*” character followed by a one to four digit channel number (in ASCII) sets the
radio to that channel.
• Each command must be terminated with an ASCII “CR” character to initiate execu-
tion of the command.
- If the command requires no reply, the radio then responds with a “-” prompt char-
acter.
- If a reply is required, the radio responds with a data string followed by a “CR”
and a “-” prompt . The “-” prompt indicates that the radio is ready to accept the
next command.
• There is only ever a single reply string to any command.
• Invalid commands, e.g. an invalid function number or channel number or invalid
characters in a command, cause a “{C01}”, followed by “CR” and “-”, to be sent in
reply, indicating a command error.
• In CCTM the radio will accept a reset command character (refer to Section 5.8.5).
• ASCII line feed characters are permitted at any time, but are ignored so that test
commands may be terminated with “CR” or “LF”.
• All switches (including PTT, hook etc), keys and displays on the front panel or con-
trol head of the radio are disabled while in CCTM, and no tones are sounded.