B.19 COM Port Connector (CN21)
Table B.19: COM Port Connector (CN21)
Pin | Signal | Pin | Signal |
1 | COM1 DCD | 2 | COM1 DSR |
3 | COM1 RX | 4 | COM1 RTS |
5 | COM1 TX | 6 | COM1 CTS |
7 | COM1 DTR | 8 | COM1 RI |
9 | GND | 10 | GND |
11 | COM2 DCD/485TX- | 12 | COM2 DSR |
13 | COM2 RX /485TX+ | 14 | COM2 RTS |
15 | COM2 TX /485RX+ | 16 | COM2 CTS |
17 | COM2 DTR/485RX- | 18 | COM2 RI |
19 | GND | 20 | GND |
21 | COM3 DCD | 22 | COM3 DSR |
23 | COM3 RX | 24 | COM3 RTS |
25 | COM3 TX | 26 | COM3 CTS |
27 | COM3 DTR | 28 | COM3 RI |
29 | GND | 30 | GND |
31 | COM4 DCD | 32 | COM4 DSR |
33 | COM4 RX | 34 | COM4 RTS |
35 | COM4 TX | 36 | COM4 CTS |
37 | COM4 DTR | 38 | COM4 RI |
39 | GND | 40 | GND |
Appendix B Pin Assignments
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