Changing Modem Modes (Responder/Transponder/Modem)
Micron Modem
0630-SOM-00001, Issue: 03
23
© Tritech International Ltd.
A.2. Changing Modes using a Terminal Program
Note
In order to use this functionality the modem must have firmware
MiniModemV9.bin
or greater
This can be checked by looking at the unit build record or the value after the
S
in the
CPUID
when the unit is in setup mode, see Section 5.1, “Enabling Setup
Note
Currently you can only change the operation of the modem using the terminal
programs. You cannot assign Transponders numbers other that
T1
The Micron Modem will only accept
RS232
commands at
9600
baud on the Main Port when
the unit is idle.
By waiting more than two seconds, the input buffer will automatically be flushed, guaranteeing
that RS232 commands will be accepted. Alternatively this can be managed by keeping tight
control over how many characters are sent to the unit and making sure that it is a multiple of
four before issuing an RS232 command. The Micron Modems will fill out unused characters
with NULL characters after the two seconds timeout and transmit four characters acoustically.
The supported command set in the Micron Modem are
Command
Function
%MS<LF>
Sets the unit type as Modem Master (Surface)
%SL<LF>
Sets the unit type as Modem Slave (Subsea)
%RE<LF>
Sets the unit type as Responder
%TR<LF>
Sets the unit type as Transponder
%VQ<LF>
Queries the version and unit type.
This is replied to with the version number and unit type e.g. %VR09TR
When changing the unit type, there is a delay of approximately 3 seconds while the unit re-
initialises and is able to operate in the new mode.
