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CDM-750 Advanced High-Speed Trunking Modem
Appendix D
Command
Parameter
Number of
(Instruction
Type
Arguments
& Qualifier)
RX LO
RLO=
6 bytes
Frequency
Rx Pilot
N/A
N/A
Rx Spectrum
N/A
N/A
Inversion
Rx Symbol Rate RSR=
10 bytes, numeric
Rx Terminal
N/A
10 bytes
(Satellite)
Frequency
Description of Arguments
Command or Query.
LNB Rx LO frequency information in the form xxxxxs, where:
xxxxx is the LO frequency – 03000 through 65000 MHz, or 00000 (Off)
s is the sign for the MIX (+ or –) (Note: negative mix induces spectral inversion)
Notes:
For additional information refer to Chapter 5. FRONT PANEL OPERATION for LO,
MIX, and Spectrum Settings.
Terminal Frequency=RX LO ± modem RFQ (see below)
Query only.
Rx Pilot status in the form x, where:
0=Off
1=On
Note: This is automatically detected on demod acquisition, but if the demod is not
locked, the query returns 'x'.
Example: RPI=0 (Pilots=Off)
Query only.
Rx Spectrum Inversion in the form x, where:
0=Normal
1=Spectrum Inverted
Example: RSI=0 (Normal)
Command or Query.
Rx Symbol Rate in Ksps in the form ssssss.sss:
Valid ranges:
QPSK/8PSK – 1 to 63Msps
16APSK – 1 to 47Msps
32APSK – 1 to 38Msps
Note: If the symbol rate is set, then the data rate will be automatically calculated
and updated.
Query only.
Rx Terminal (Satellite) Frequency, which is the frequency (MHz) being received
from the satellite, in the form xxxxx.xxxx:
Resolution=100 Hz
Returns 00000.0000 if LNB LO is zero
Note: For additional information refer to Chapter 5.FRONT PANEL OPERATION
for LO, MIX, and Spectrum Settings.
Example: RTF=11650.2249 (MHz)
D–13
Query
Response to
(Instruction &
Response to Query
Command
Qualifier)
RLO=
RLO?
RLO=xxxxxs
RLO?
(see Description of
RLO*
Arguments)
RLO#
RPI=
RPI?
RPI=x
RPI?
RPI*
RPI#
RSI=
RSI?
RSI=x
RSI?
(see Description of
Arguments)
RSI*
RSI#
RSR=
RSR?
RSR=xxxxxx.xxx
(see Description of
RSR?
Arguments)
RSR*
RSR#
N/A
RTF?
RTF=xxxxx.xxxx
(see Description of
Arguments)
Revision 1
MN-CDM750
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