Comtech EF Data CDM-710, Installation And Operation Manual

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CDM-710 Broadcast Satellite Modem Revision 11
Appendix A MN/CDM710.IOM
A–5
!
(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 no message arguments).
#
(ASCII code 35) If the Controller sends a correctly formatted command, BUT the modulator is not in remote mode, it will not allow
reconfiguration and will respond with TFQ#
∼
(ASCII 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.
A.5.6 Optional Message Arguments
Arguments are not required for all messages. Arguments are ASCII codes for the characters 0 to 9 (ASCII codes 48 to 57), period (ASCII
code 46) and comma (ASCII code 44).
A.5.7 End Of Packet
Controller-to-Target: This is the ‘Carriage Return’ character (ASCII code 13).
Target-to-Controller: This is the two-character sequence ‘Carriage Return’, ‘Line Feed’ (ASCII codes 13 and 10). Both indicate the
valid termination of a packet.