
Table 4. DB-25 Pin Allocation
(
V.35)
Pin Name Type
1 SHIELD
2 TxD-A Output
3 RxD-A Input
4 RTS-A Output
5 CTS-A Input
6 NC
7 GND
8
9 RCLK-B Input
10 NC
11 NC
12 TCLK-B Input
13 NC
14 TxD-B Output
15 TCLK-A Input
16 RxD-B Input
17 RCLK-A Input
18 NC
19 NC
20 NC
21 NC
22 NC
23 NC
24 NC
25 NC
Table 5. DB-25 Pin Allocation
(V.11)
(used for RS-530, X.21, V.36)
Pin Name Type
1 SHIELD
2 TxD-A Output
3 RxD-A Input
4 RTS-A Output
5 CTS-A* Input
6 NC
7 GND
8 NC
9 RCLK-B Input
10 NC
11 NC
12 TCLK-B Input
13 CTS-B* Input
14 TxD-B Output
15 TCLK-A Input
16 RxD-B Input
17 RCLK-A Input
18 NC
19 RTS-B Output
20 NC
21 NC
22 NC
23 NC
24 NC
25 NC
* Indication signal for X.21
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