Comtech EF Data CDM-625 - Manual (Page 469)

CDM-625 Advanced Satellite Modem Revision 15
Appendix D MN-CDM625
D–5
2. From Target-to-Controller, the only permitted values are:
Symbol Explanation
=
(ASCII code 61)
The ‘=’ code is used in two ways:
a. If the Controller has sent a query code to a Target.
Example: TFQ? (meaning ‘what’s the Transmit frequency?’), the Target would respond with TFQ=xxxx.xxxx, where xxxx.xxxx
represents the frequency in question.
b. If the Controller sends an instruction to set a parameter to a particular value, then, providing the value sent is valid, the Target will
acknowledge the message by replying with TFQ= (with no message arguments).
?
(ASCII code 63)
If the Controller sends an instruction to set a parameter to a particular value, then, if the value sent is not valid, the Target will
acknowledge the message by replying (for example) with TFQ? (with no message arguments). This indicates that there was an error in
the message sent by the Controller.
!
(ASCII code 33)
If the Controller sends an instruction code which the Target does not recognize, the Target will acknowledge the message by echoing
the invalid instruction, followed by the ! character.
Example: XYZ!
*
(ASCII code 42)
If the Controller sends an instruction to set a parameter to a particular value, then, if the value sent is valid BUT the modulator will not
permit that particular parameter to be changed at this time, the Target will acknowledge the message by replying, for example, with
TFQ* (with message arguments).
#
(ASCI code 35)
If the Controller sends a correctly formatted command BUT the modem is in local mode, it will not allow reconfiguration and will
respond with TFQ#
~
(ASCI code 126)
If a message was sent via a local modem to a distant end device or ODU, the message was transmitted transparently through the
local modem. In the event of the distant-end device not responding, the local modem would generate a response.
Example: 0001/RET~ (indicating that it had finished waiting for a response and was now ready for further comms).
^
(ASCI code 94)
If the Controller sends a correctly formatted command BUT the modem is in Ethernet Remote mode, it will not allow reconfiguration,
and will respond with TFQ^.