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SDM-2020 Satellite Demodulator
Single-ended signals (MF and DF fault signals) are open collector where:
A pull-up resistor, external to the equipment, is required.
The fault signals, MF and DF, operate as follows: A fault is indicated by an "OFF" (high)
and OK status is indicated by an "ON" (low).
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
A.4.3.3
Receive Output Connectors, J6/J7, BNC, Female
Duplicate signals exit both of these connectors on the demodulator to deliver receive data
to the terrestrial interface. J6 and J7 are both active at all times, and no selection is
required.
Rev.3
V
=12V max. and V
oh
ol
Table A-12. RS-422 Connector Pinout (Per EIA-530), J5
Signal Function
530 Shield
Transmit Data (TD-A)
Receive Data (RD-A)
Request To Send (RS-A)
Clear To Send (CS-A)
DCE Ready (DM-A)
Signal Ground
Receive Line Signal Detect (RR-A)
Receive Timing (RT-B)
Receive Line Signal Detect (RR-B)
Terminal Timing (TT-B)
Send Timing (ST-B)
Clear To Send (CS-B)
Transmit Data (TD-B)
Send Timing (ST-A)
Receive Data (RD-B)
Receive Timing (RT-A)
Request To Send (RS-B)
Not Used
Demodulator Fault (DF)
DCE Ready (DM-B)
Not Used
Terminal Timing (TT-A)
Modulator Fault (MF)
=0.5V max. @ I
=8 ma.
ol
Name
Type
Shield
BA-A
I
BB-A
O
CA-A
I
CB-A
O
CC-A
O
AB
GND
CF-A
O
DD-B
O
CF-B
O
DA-B
I
DB-B
O
CB-B
O
BA-B
I
DB-A
O
BB-B
O
DD-A
O
N/C
CA-B
I
DF
O
CC-B
O
DA-A
I
MF
O
Data Interfaces
Comment
Mod/Demod
Modulator
Demodulator
Modulator
Modulator
Demodulator
Demodulator
Demodulator
Demodulator
Modulator
Modulator
Modulator
Modulator
Modulator
Demodulator
Demodulator
Modulator
Demodulator
Demodulator
Modulator
Modulator
A–25
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