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CDM-625 Advanced Satellite Modem
Appendix D
2. From Target-to-Controller, the only permitted values are:
Symbol
=
(ASCII code 61)
?
(ASCII code 63)
!
(ASCII code 33)
*
(ASCII code 42)
#
(ASCI code 35)
~
(ASCI code 126)
^
(ASCI code 94)
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).
If th e Controller sends an instruction t o s et a par ameter t o a p articular v alue, t hen, i f the v alue s ent i s not valid, t he 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.
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!
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 c hanged at this time, the Target will acknowledge the message by replying, for example, with
TFQ* (with message arguments).
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#
If a m essage was sent via a l ocal modem to a di stant 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).
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^.
Definition
D–5
Revision 13
MN-CDM625
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