Comtech EF Data SDM-2020 - Manual (Page 223)

SDM-2020 Satellite Modulator Revision 7
Remote Control Operation MN/SDM2020M.IOM
Parameter Command/Status/
Type Response Description of Arguments Comments
Symbol Rate
Assignment Command:
Response:
Status:
Response: >add/ASR_nnnnn_mm.mmmmmm'cr''lf']
>add/ASR_nnnnn_mm.mmmmmm'cr''lf']
Where:
nnnnn = 1/2 (QPSK 1/2) [Code rate], 3/4
(QPSK 3/4), 7/8 (QPSK 7/8), 5/6 (QPSK
5/6), 2/3 (QPSK 2/3), 8P23 (8PSK 2/3),
8P56 (8PSK 5/6), 8P89 (8PSK 8/9),
16Q34 (16QAM 3/4), 16Q78 (16QAM
7/8).
mm.mmmmmm = Symbol rate in MHz.
Note: When using a SMPTE 310M
interface, the data rate is fixed at
19.392658 MHz. While the code rate can
be changed as applicable, an invalid
parameter message will be generated if
any other data rate is input for change.
Set
Modulator
Output
Power Level Command:
Response:
Status:
Response: >add/MOP_snn.n'cr''lf']
>add/MOP_snn.n'cr''lf']
Where: snn.n = -20.0 to +5.0 in 0.1 steps
(nominal range in dBm).
Scrambler
Enable
(Energy
Dispersal) Command:
Response:
Status:
Response: >add/SE_xxx'cr''lf']
>add/SE_xxx'cr''lf']
Where: xxx = ON or OFF.
Modulator
Spectrum
Rotation Command:
Response:
Status:
Response: >add/MSR_xxx'cr''lf']
>add/MSR_xxx'cr''lf']
Where: xxx = NRM (normal spectrum) or
INV (inverted spectrum).
Carrier Only
Mode Command:
Response:
Status:
Response: >add/COM_xxxxxx'cr''lf']
>add/COM_xxxxxx'cr''lf']
Where: xxxxxx = OFF, DUAL, OFFSET,
or CENTER.
Transmit IF
Output
Power-up
Condition Command:
Response:
Status:
Response: >add/TXPU_xxxx'cr''lf']
>add/TXPU_xxxx'cr''lf']
Where: xxxx = LAST (last known state)
or OFF (OFF).
This command selects the state that the
TX-IF Output will be at power up.
Set
Modulator
Power Offset Command:
Response:
Status:
Response: >add/MPO_snn.n'cr''lf']
>add/MPO_snn.n'cr''lf']
Where: snn.n = +40.0 to -40.0 in 0.1 dB
increments.
Note: The modulator power offset is
added to the nominal power level.
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