PC Serial Cable Pin Specifications

C-3

PC Serial Cable Pin Specifications

The DB-25 male to DB-9 female pin assignments for the PC serial cable are provided in Table C-2.

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

 

 

 

Macintosh Serial Cable Pin Specifications

The DB-25 male to 8-pin DIN male pin assignments for the Macintosh serial cable are provided in Table C-3.

Table C-3 Macintosh COM Port Cable Pin Assignments

8-Pin DIN

 

 

Pin #

Pin Name

DB-25 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