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Data Interfaces
A.2.4.2.1
Connector Pinouts, J4, EIA-530
The connector is a sub-miniature, 25-pin, female D connector, with threaded jack nuts
(refer to Table A-5 for pinout).
Signal functions are as defined in EIA-530.
Notes:
1. The differential sense of all signals is a logic "1" when "B" is positive with
2. Only those pins indicated as "Demodulator" in the table are applicable.
Table A-5. EIA-530 Serial Interface Connector Pinout (J4)
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–10
respect to "A," as defined in EIA-530.
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)
Demodulator Fault (DF)
DCE Ready (DM-B)
Terminal Timing (TT-A)
Modulator Fault (MF)
SDM-2020 Satellite Demodulator
Name
Type
Comment
Shield
Mod/Demod
BA-A
I
Modulator
BB-A
O
Demodulator
CA-A
I
Modulator
CB-A
O
Modulator
CC-A
O
Demodulator
AB
GND
CF-A
O
Demodulator
DD-B
O
Demodulator
CF-B
O
Demodulator
DA-B
I
Modulator
DB-B
O
Modulator
CB-B
O
Modulator
BA-B
I
Modulator
DB-A
O
Modulator
BB-B
O
Demodulator
DD-A
O
Demodulator
N/C
CA-B
I
Modulator
N/A
N/A
O
Demodulator
CC-B
O
Demodulator
N/A
DA-A
I
Modulator
N/A
O
Modulator
Rev.3
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