Pinouts >  Serial interfaces cables and converters scheme
9 pin D-SUB female connector layout
9 pin D-SUB female connector
this adapter is used for diagnostic of rs-232 de-9 serial port

PC-check Loopback 

Short pins in
loopback connector
Description
1-4-9  
2-3  
6-7-8  

CheckIt/Norton/PassMark Loopback

Name Short pins Name
CD 1 4,6,9 DSR
RXD 2 3 TXD
DTR 4 6 DSR
RTS 7 8 CTS

Loopback, or loop-back, refers to the routing of electronic signals, digital data streams, or flows of items back to their source without intentional processing or modification. This is primarily a means of testing the transmission or transportation infrastructure. A communications transceiver can use loopback for testing its functionality. For example, a device transmit pin connected to its receive pin will result in the device receiving exactly what it transmits. Moving this looping connection to the remote end of a cable adds the cable to this test.

9 pin D-SUB male connector layout
9 pin D-SUB male connector
According to 4 reports in our database (4 positive and 0 negative) the Serial (9 pin) port Loopback pinout should be correct.

Is this pinout
Serial (9 pin) port Loopback visual pinout:click to enlarge
Copyright © 2000-2021 by pinouts.ru team, except user uploaded images.
No portion of this webpage may be reproduced in any form without visible link to Pinouts.ru .
Efforts have been made to ensure this page is correct, but it is the responsibility of the user to verify the data is correct for their application.