Comtech EF Data SDM-2020 User Manual
Page 133
SDM-2020 Satellite Demodulator
Revision 4
RS-422 Data Interface
MN/SDM2020D.IOM
7–7
7.3.1.2.1
Connector Pinouts, J4, EIA-530
The connector is a sub-miniature, 25-pin, female D connector, with threaded jack nuts
(refer to Table 7-3 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
respect to “A,” as defined in EIA-530.
2. Only those pins indicated as “Demodulator” in the table are applicable.
Table 7-3. EIA-530 Serial Interface Connector Pinout (J4)
Pin #
Signal Function
Name
Type
Comment
1 530
Shield
Shield
Mod/Demod
2
Transmit Data (TD-A)
BA-A
I
Modulator
3
Receive Data (RD-A)
BB-A
O
Demodulator
4
Request To Send (RS-A)
CA-A
I
Modulator
5
Clear To Send (CS-A)
CB-A
O
Modulator
6
DCE Ready (DM-A)
CC-A
O
Demodulator
7 Signal
Ground
AB GND
8
Receive Line Signal Detect (RR-A)
CF-A
O
Demodulator
9
Receive Timing (RT-B)
DD-B
O
Demodulator
10
Receive Line Signal Detect (RR-B)
CF-B
O
Demodulator
11
Terminal Timing (TT-B)
DA-B
I
Modulator
12
Send Timing (ST-B)
DB-B
O
Modulator
13
Clear To Send (CS-B)
CB-B
O
Modulator
14
Transmit Data (TD-B)
BA-B
I
Modulator
15
Send Timing (ST-A)
DB-A
O
Modulator
16
Receive Data (RD-B)
BB-B
O
Demodulator
17
Receive Timing (RT-A)
DD-A
O
Demodulator
18
N/C
19
Request To Send (RS-B)
CA-B
I
Modulator
20
N/A
21
Demodulator Fault (DF)
N/A
O
Demodulator
22
DCE Ready (DM-B)
CC-B
O
Demodulator
23
N/A
24
Terminal Timing (TT-A)
DA-A
I
Modulator
25
Modulator Fault (MF)
N/A
O
Modulator