RS-232 serial loopback adapter

The following RS-232 connectors can be used to test a serial port on your POS system. The data and handshake lines have been linked. In this way all data will be sent back immediately. Please verify that your adapter is compatible with this configuration.



Pinout

DB9

DB25

Function

1 + 4 + 6

6 + 8 + 20

DTR

->

CD + DSR

2 + 3

2 + 3

Tx

->

Rx

7 + 8

4 + 5

RTS

->

CTS