APOLLO Technical Manual
Jumpers and connectors
J22A and J22B – COM3 and 4 RS232 serial ports
20 way, 2.54mm (0.1") x 2.54mm (0.1") boxed header.
Mating Connector:
Pin
(20-way
header)
Signal name
Pin
(9-way
D-type plug)
1
Data Carrier Detect (DCD) COM3 1
2
Data Set Ready (DSR) COM3
6
3
Receive Data (RX) COM3
2
4
Request To Send (RTS) COM3
7
5
Transmit Data (TX) COM3
3
6
Clear To Send (CTS) COM3
8
7
Data Terminal Ready (DTR)
COM3
4
8
Ring Indicator (RI) COM3
9
9 Ground
COM3
5
10 No
Connect
-
11
Data Carrier Detect (DCD) COM4 1
12
Data Set Ready (DSR) COM4
6
13
Receive Data (RX) COM4
2
14
Request To Send (RTS) COM4
7
15
Transmit Data (TX) COM4
3
16
Clear To Send (CTS) COM4
8
17
Data Terminal Ready (DTR)
COM4
4
18
Ring Indicator (RI) COM4
9
19 Ground
COM4
5
20 No
Connect
-
1
2
19
20
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