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CDM-500 Closed Network Satellite Modem
Parameter
Command
Arguments
Type
(Instruction
for Command
Code and
or Response to
qualifier)
Query
Rx FEC Code
RCR=
1 byte, value of
Rate
1,3 or 7
Rx
RMD=
1 byte, value of
Modulation
1or 2
Type
Rx Spectrum
RSI=
1 byte, value of
Invert
0 or 1
Rx
RDS=
1 byte, value of
Descrambler
0 or 1
Rx Demod
RSW=
2 bytes,
Acq Sweep
numerical
Width
Rx Clock
RCK=
1 byte, value of
Mode
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.
Rx FEC Code rate, where:
1 = Rate 1/2,
3 = Rate 3/4,
7 = Rate 7/8
All other codes invalid.
Example: RCR=1 (which is Rate 1/2)
Command or Query
Rx Modulation type, where:
1 = BPSK
2 = QPSK
All other codes invalid.
Example: RMD=1 (BPSK)
Command or Query.
Rx Spectrum Invert selection, where:
0 = Normal
1 = Rx Spectrum Inverted
All other codes invalid.
Command or Query.
Rx De-scrambler state, where:
0 = Off
1 = On (V.35 in unframed mode, synchronous in
framed mode
All other codes invalid.
Example: RDS=1 (which is de-scrambler On)
Command or Query.
Rx ± acquisition sweep range of demodulator, in
kHz, ranging from ± 1 kHz to ± 30 kHz.
Example: RSW=09 (which is 9 kHz)
Rx Clock mode, where:
Command or Query.
0 = Buffer disabled
1 = Buffer enabled
All other codes invalid.
Example: RCK=0 (which is buffer disable)
Response to
Query
Command (target to
(Instruction
controller)
Code and
qualifier)
RCR= (message ok)
RCR?
RCR? (received ok,
but invalid argument
found)
RCR* (message ok,
but not permitted in
current mode
RMD= (message ok)
RMD?
RMD? (received ok
but invalid argument
found)
RMD* (message ok,
but not permitted in
current mode)
RSI= (message ok)
RSI?
RSI? (received ok,
but invalid argument
found)
RSI* (message ok,
but not permitted in
current mode)
RDS= (message ok)
RDS?
RDS? (received ok,
but invalid argument
found)
RDS* (message ok,
but not permitted in
current mode)
RSW= (message ok)
RSW?
RSW? (received ok,
but invalid arguments
found)
RSW* (message ok,
but not permitted in
current mode)
RCK= (message ok)
RCK?
RCK? (received ok,
but invalid argument
found)
RCK* (message ok,
but not permitted in
current mode)
Remote Control
Response to
query (target
to controller)
RCR=x
(same format as
command
argument)
RMD=x
(same format as
command
argument)
RSI=x
(same format as
command
argument)
RDS=x
(same format as
command
argument)
RSW=xx (same
format as
command
arguments)
RCK=x
(same format as
command
argument)
B–9
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