Installation
SDM-2020 Satellite Demodulator
2–8
Rev. 3
2.3.2
Remote Connector and Pinout (J1)
The remote control connection is a 9-pin female D connector located on the rear panel of
the demodulator. Screw locks are provided for mechanical security of the mating
connector.
The remote connector provides a way for issuing commands and determining the unit’s
status. This connector provides EIA-232, EIA-485 (2-wire), and EIA-485 (4-wire)
operation. The communications protocol and the control and status commands are
described in Appendix B.
Table 2-2 provides the pinout of the J1 connector.
Table 2-2. Remote Control Connector Pinout (J1)
Remote Control Connector (J1) Pinout
EIA-232
EIA-485(2)
EIA-485(4)
Signal
Type
Signal
Type
Signal
Type
Pin #s
GND
GND
GND
GND
GND
GND
1
RXD
O
N/A
N/A
N/A
N/A
2
TXD
I
N/A
N/A
N/A
N/A
3
N/A
N/A
+RX/+TX
I/O
+TX
I
4
GND
GND
-RX/-TX
I/O
-TX
I
5
DSR
O
N/A
N/A
N/A
N/A
6
RTS
I
N/A
N/A
N/A
N/A
7
CTS
O
+RX/+TX
I/O
+RX
O
8
N/A
N/A
-RX/-TX
I/O
-RX
O
9
Summary of Contents for SDM-2020
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