A. Pinouts
A-4
March 2001
8820-A2-GN20-30
DB25 Adapter Pinouts
The DB25 (RS-232 male) cable adapter is used to convert the 8-pin modular serial
interface to a standard RS-232 DB25 interface, which can then be connected to a
terminal, computer, or any Data Termination Equipment (DTE). Connection to a
modem requires a null modem adapter. The following table lists the pin
assignments.
DB9 Adapter Pinouts
The female DB9 cable adapter is used to convert the 8-pin modular serial interface
to a standard DB9 interface, which can then be connected to a laptop computer.
The following table lists the pin assignments.
8-Pin Modular
Serial Interface
Pin Number
Use
DB25
Interface Pin
Number
1
2
Pins 1 and 2 are
shorted together
–
3
Data Terminal Ready
20
4
Signal Ground
7
5
Receive Data
3
6
Transmit Data
2
7
Clear to Send
5
8
Request to Send
4
99-15388a
8-Pin Modular
Serial Interface
Pin Number
Use
DB9
Interface Pin
Number
1
2
Pins 1 and 2 are
shorted together
–
3
Data Terminal Ready
4
4
Signal Ground
5
5
Receive Data
2
6
Transmit Data
3
7
Clear to Send
8
8
Request to Send
7
99-16049a