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
