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PC Serial Cable Pin Specifications C-3
PC Serial Cable Pin Specifications
The DB25 male to DB9 female pin assignments for the PC
serial cable are provided in Table C-2.
Macintosh Serial Cable Pin Specifications
The DB25 male to 8-pin DIN male pin assignments for the
Macintosh serial cable are provided in Table C-3.
Table C-2 PC COM Port Cable Pin Assignments
DB9 Pin # Pin Name DB25 Pin #
1 Data Carrier Detect (DCD) 8
2 Receive Data (RD) 3
3 Send Data (SD) 2
4 Data Terminal Ready (DTR) 20
5 Signal Ground (GND) 7
6 Data Set Ready (DSR) 6
7 Request to Send (RTS) 4
8 Clear to Send (CTS) 5
9 Ring Indicator (RI) 22
— Shield 1
Table C-3 Macintosh COM Port Cable Pin Assignments
8 Pin DIN
Pin #
Pin Name DB25 Pin #
1 Data Terminal Ready (DTR) 20, 4
2 Clear to Send (CTS) 5
3 Send Data (SD) 2
4, 8 Signal Ground (GND) 7
5 Receive Data (RD) 3
7 Data Carrier Detect (DCD) 8