Comtech EF Data CDM-500 - Manual (Page 72)

CDM-500 Closed Network Satellite Modem Remote Control
Rev. 1.3 B–7
Parameter
Type Command
(Instruction
Code and
qualifier) Arguments
for Command
or Response to
Query Description of arguments
(note that all arguments are ASCII numeric codes,
that is, ASCII codes between 48 and 57) Response to
Command (target to
controller) Query
(Instruction
Code and
qualifier) Response to
query (target
to controller)
Tx Frequency TFQ= 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 has the 70 MHz or 140 MHz
synthesizer option fitted.
TFQ= (message ok)
TFQ? (received ok,
but invalid arguments
found)
TFQ* (message ok,
but not permitted in
current mode)
TFQ? TFQ=xxx.xxxx
(same format as
command
arguments)
Tx Data Rate TDR= 7 bytes
Command or Query.
Tx Data rate, in kbps, between 2.4 kbps and 512
kbps. Resolution = 1 bps.
Example: TDR=511.999 (which is 511.999 kbps)
TDR= (message ok)
TDR? (received ok,
but invalid arguments
found)
TFQ* (message ok,
but not permitted in
current mode) TDR? TDR=xxx.xxx
(same format as
command
arguments)
Tx
FEC Code
Rate TCR= 1 byte, value of
1,3 or 7 Command or Query.
Tx FEC Code rate, where:
1 = Rate 1/2
3 = Rate 3/4
7 = Rate 7/8
All other codes invalid.
Example: TCR=1 (which is Rate 1/2) TCR= (message ok)
TCR? (received ok,
but invalid argument
found)
TCR* (message ok,
but not permitted in
current mode) TCR? TCR=x (same
format as
command
argument)
Tx
Modulation
Type TMD= 1 byte, value
of 1 or 2 Command or Query.
Tx Modulation type, where:
1 = BPSK,
2 = QPSK
All other codes invalid.
Example: TMD=2 (which is QPSK) TMD= (message ok)
TMD? (received ok,
but invalid argument
found)
TMD* (message ok,
but not permitted in
current mode) TMD? TMD=x (same
format as
command
argument)
Tx Spectrum
Invert TSI= 1 byte, value of
0 or 1 Command or Query.
Tx Spectrum Invert selection, where:
0 = Normal,
1 = Tx Spectrum Inverted
All other codes invalid.
Example:TSI=0 (which is normal) TSI= (message ok)
TSI? (received ok,
but invalid arg.
found)
TSI* (message ok,
but not permitted in
current mode) TSI? TSI=x (same
format as
command
argument)