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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.
8-Pin Modular
Serial Interface
Pin Number
Use
DB25
Interface Pin
Number
1
Pins 1 and 2 are
–
1
2
Pi
ns
1
an
d
2
are
shorted together
–
2 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
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
DB9
Interface Pin
Number
1
Pins 1 and 2 are
–
1
2
Pi
ns
1
an
d
2
are
shorted together
–
2 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