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A.2 Serial port - WAN
A DB25 male socket connects to the Data Communication Equipment (DCE).
Pin RS-530 V.35 V.24/V.28 X.21/V.11 I/O
1 101–F.GND 101–F.GND 101–F.GND F. GND -
2 103 (A) – TXD (A) 103 A – TXD A 103 – TXD TA (Transmit) O
3 104 (A) – RXD (A) 104 A – RXD A 104 – RXD RA (Receive) I
4 105 (A) – RTS (A) 105 – RTS 105 – RTS CA (Command) O
5 106 (A) – CTS (A) 106 – CTS 106 – CTS I
6 107 (A) – DSR (A) 107 – DSR 107 – DSR I
7 102–S.GND 102–S.GND 102–S.GND S.GND -
8 109 (A) – CD (A) 109 – CD 109 – CD IA (Indication) I
9 115 (B) – RCK (B) 115 B - RCK B SB (Clock) I
10 109 (B) – CD (B) IB (Indication) I
11 113 (B) – XCK (B) 113 B - XCK-B XB O
12 114 (B) – TCK (B) 114 B – TCK B I
13 106 (B) – CTS (B) I
14 103 (B) – TXD (B) 103 B – TXD B TB (Transmit) O
15 114 (A) – TCK (A) 114 A – TCK A 114 – TCK I
16 104 (B) – RXD (B) 104 B – RXD B RB (Receive) I
17 115 (A) – RCK (A) 115 A – RCK A 115 – RCK SA (Clock) I
18 141 – LL 141 – LL 141 – LL O
19 105 (B) – RTS (B) CB (Command) O
20 108 (A) – DTR (A) 108 – DTR 108 – DTR O
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22 107 (B) – DSR (B) I
23 108 (B) – DTR (B) O
24 113 (A) – XCK (A) 113 A – XCK A 113 – XCK XA O
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