Comtech EF Data SDM-2020, Installation And Operation Manual

Page: 180 / 215

SDM-2020 Satellite Demodulator Remote Control Operation
Rev. 3 B–5
B.3 Configuration Commands/Responses
B.3.1 Demodulator Configuration Commands
Demodulator
Frequency Command:
Response:
Status:
Response:
<add/DF_nnnn.nnnn'cr'
>add/DF_nnnn.nnnn'cr''lf']
<add/DF_'cr'
>add/DF_nnnn.nnnn'cr''lf']
Where: nnnn.nnnn =
For L-Band only: Frequency in MHz, 950.0000 to
1750.0000 in 2.5 kHz steps.
For 70/140 MHz only: Frequency in MHz, 70.0000 to
180.0000 in 2.5 kHz steps.
Demodulator
Rate
Assignment Command:
Response:
Status:
Response:
<add/ADRV_nnnnn_mmm.mmmmmm'cr
'
>add/ADRV_nnnnn_mmm.mmmmmm'cr
''lf']
<add/ADRV_'cr'
>add/ADRV_nnnnn_mmm.mmmmmm'cr
''lf']
Where:
nnnnn = 1/2 (QPSK 1/2) [Decoder 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), 16QAM3/4, 16QAM7/8.
mmm.mmmmmm = Data 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.
Symbol Rate
Assignment Command:
Response:
Status:
Response:
<add/ASR_nnnnn_mm.mmmmmm'cr'
>add/ASR_nnnnn_mm.mmmmmm'cr''lf']
<add/ASR_'cr'
>add/ASR_nnnnn_mm.mmmmmm'cr''lf']
Where
nnnnn = 1/2 (QPSK 1/2) [Decoder 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), 16QAM3/4, 16QAM7/8.
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.
Descrambler
Enable Command:
Response:
Status:
Response:
<add/DE_xxx'cr'
>add/DE_xxx'cr''lf']
<add/DE_'cr'
>add/DE_xxx'cr''lf']
Where: xxx = ON or OFF.
Sweep Width
Range Command:
Response:
Status:
Response:
<add/SWR_nnnnnnn'cr'
>add/SWR_nnnnnnn'cr''lf']
<add/SWR_'cr'
>add/SWR_nnnnnnn'cr''lf']
Where: nnnnnnn=
For L-Band only: 0 to 1000000 in 1 Hz steps.
For 70/140 MHz only: 0 to 60000 in 1 Hz steps.
Sweep
Reacquisi-
tion Command:
Response:
Status:
Response:
<add/SR_xxx'cr'
>add/SR_xxx'cr''lf']
<add/SR_'cr'
>add/SR_xxx'cr''lf']
Where: xxx = 0 to 999 (number of seconds).