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CDM-750 Advanced High-Speed Trunking Modem
Serial-based Remote Product Management
Character
?
(ASCII code 63)
!
(ASCII code 33)
*
(ASCII code 42)
#
(ASCII code 35)
∼
(ASCII Code 126)
7.4.2.6
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), 'A' to 'Z'
(ASCII codes 65 to 90)period '.' (ASCII code 46), and comma ',' (ASCII code 44).
7.4.2.7
End of Packet
•
Controller‐to‐Target: This is the 'Carriage Return' ([CR]) character (ASCII code 13).
•
Target‐to‐Controller: This is the two‐character sequence 'Carriage Return', 'Line Feed' ([cr][lf]) (ASCII codes 13 and 10). Both
indicate the valid termination of a packet.
Definition
If the Controller sends an instruction to set a parameter to a particular value, and the value sent is not valid, the Target then
acknowledges the message and responds with, for example, 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 that the Target does not recognize, the Target responds by echoing the invalid instruction,
followed by ! For example: ABC!
If the Controller sends the command to set a parameter to a particular value, and the value sent is valid BUT the modem will not
permit that particular parameter to be changed at present, the Target acknowledges the message and responds with, for example,
TFQ* (with message arguments).
If the Controller sends a correctly formatted command, BUT the unit is not in Remote Mode, it does not allow reconfiguration and
responds, for example, with TFQ#.
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. For example:
0001/RET~ indicates that it has finished waiting for a response and is now ready for further communications.
7–6
Revision 2
MN-CDM750
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