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DCE / DTE Connection Description
D
CE DTE DCE DTE
DB-
9 DB-9 DB-25 DB-25
1 1 (PG) 1 1
2 3 3 2 2 3
3 2 2 3 3 2
8 7 5 4 4 5
7 8 4 5 5 4
6 6 6 6 (DSR) 6 6
5 5 7 7 SG 7 7
1 1 8 8 (CD) 8 8
9 9 9 9
10 10 10 10
11 11 11 11
12 12 (SCD) 12 12
13 13 (SCS) 13 13
14 14 (STD) 14 14
15 15 (TC) 15 15
16 16 (SRD) 16 16
17 17 (RC) 17 17
18 18 18 18
19 19 (SRS) 19 19
4 4 20 20 (DTR) 20 20
21 21 (SQD) 21 21
9 9 22 22 (RI) 22 22
23 23 (DRS) 23 23
24 24 (XTC) 24 24
25 25 25 25
Tx Rx
Rx Tx
RTS CTS
CTS RTS
Cable
25/25 or
9/25 pin
IC-485AIDevice’s Connector Pin #
DCE DTE
DB-25
DB-25