Comtech EF Data SDM-2020, Installation And Operation Manual

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SDM-2020 Satellite Demodulator Remote Control Operation
Rev. 3 B–21
B.9 Data Interfaces
B.9.1 RS422 Interface Commands
Interface
Select
Command Command:
Response:
Status:
Response:
<add/ISEL_xxx'cr'
>add/ISEL_xxx'cr''lf']
<add/ISEL_'cr'
>add/ISEL_'cr''lf']
Where: xxx = DVB or 530.
This command selects which interface connector will be used
for data.
DM State
Control Command:
Response:
Status:
Response:
<add/DM_xxx'cr'
>add/DM_xxx'cr''lf']
<add/DM_'cr'
>add/DM_xxx'cr''lf']
Where: xxx = NRM (normal sense) or INV (inverted sense).
This command controls the logic sense of the DM (DCE-ready)
signal.
RR State
Control Command:
Response:
Status:
Response:
<add/RR_xxx'cr'
>add/RR_xxx'cr''lf']
<add/RR_'cr'
>add/RR_xxx'cr''lf']
Where: xxx = NRM (normal sense) or INV (inverted sense).
This command controls the logic sense of the RR (receiver
ready) signal.
Where ‘pn’ is the last parameter returned.
Parameter
Number
Parameter Name
(Command Reference Description
23
24
25
26
27 to 32
Interface Select
(ref. ‘ISEL_”command).
Reserved
DM State Control
(ref. ‘DM_”command)
RR State Control
(ref. ‘RR_’command)
Reserved
p23 = n, where n = ‘0’ (DVB), ‘1’ (530)
p25 = n, where n = ’0’ (Normal), ‘1’ (Parallel)
p26 = n, where n = ‘0’ (Normal), ‘1’ Parallel)