### EIA-232D SYNC/570 Cabling

Use these diagrams as a reference when building or purchasing EIA-232 cables. See Tips for Building and Purchasing Cables for cable length and quality concerns.

DB-15 Pin Number | Signal | DB-25 Pin Number | DB-15 Female Connector
1 | Not connected | 1
2 | TxD Transmitted Data | 2
3 | RxD Received Data | 3
4 | RTS Request to Send | 4
5 | CTS Clear to Send | 5 | DB-25 Male Connector
6 | DSR Data Set Ready | 6
7 | Signal Ground | 7
8 | DCD Data Carrier Detect | 8
12 | RxC Receive Clock | 17
13 | TxC Transmit Clock (Output) | 24
14 | TxC Transmit Clock (Input) | 15
15 | DTR Data Terminal Ready | 20
shell | CGND | shell