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