Comtech EF Data CDM-550T Manual page 121

CDM-550T Satellite Modem
Parameter Command
Type (InstructionC
ode and
qualifier)
Tx Frequency TFQ=
Tx TDR=
Data Rate
Tx TFT=
FEC Type
Rev. 1.3
Arguments for Description of arguments
Command or (note that all arguments are ASCII numeric codes, that is,
Response to ASCII codes between 48 and 57)
Query
8 bytes Command or Query.
Tx Frequency, 52 MHz to 88 MHz, (70 MHz band) or 104
MHz to 176 MHz, (140 MHz band).
Resolution = 100Hz.
Example: TFQ=072.9876 (70 MHz option)
TFQ=148.0000 (140 MHz option)
Note: Querying 'Options Fitted' (using EID?) will indicate if
the unit is 70 MHz or 140 MHz IF band
8 bytes Command or Query.
Tx Data rate, in kbps, between 2.4 kbps and 2048 kbps.
Resolution = 1 bps.
Example: TDR=2047.999 (which is 2047.999 kbps)
1 byte, value of Command or Query.
0 through 8 Tx FEC coding type, where:
0 = None (uncoded - no FEC)
1 = Viterbi
2 = Sequential
3 = Viterbi + Reed-Solomon
4 = Sequential + Reed-Solomon
5 = Rate 3/4 QPSK Turbo (S/W Version < 1.15)
6 = Rate 21/44 BPSK Turbo (S/W Version > 1.14)
7 = Rate 5/16 BPSK Turbo (S/W Version > 1.14)
8 = Rate 3/4 OQPSK Turbo (S/W Version >1.18)
All other codes invalid.
Example: TFT=1 (which is Viterbi coding)
Note: If the RS Codec option is not installed, and the argument
3 or 4 is used, the target will return TFT?
If the Turbo Codec option is not installed, and the argument 5
or greater is used, the target will return TFT? Use EID? to
query the options fitted.
Values 5 – 8 may affect TCR and TMD.
Response to Command Query
(target to controller) (Instruction
Code and
qualifier)
TFQ= (message ok) TFQ?
TFQ? (received ok,
but invalid arguments
found)
TFQ* (message ok, but
not permitted in current
mode)
TDR= (message ok) TDR?
TDR? (received ok,
but invalid arguments
found)
TFQ* (message ok, but
not permitted in current
mode)
TFT= (message ok) TFT?
TFT? (received ok,
but invalid argument
found)
TFT* (message ok, but
not permitted in current
mode)
Remote Control
Response to query
(target to controller)
TFQ=xxx.xxxx (same
format as command
arguments)
TDR=xxxx.xxx (same
format as command
arguments)
TFT=x
(same format as
command arguments)
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