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9 pin D-SUB female connector layout
9 pin D-SUB female connector
at the computer
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
at the loopback
Pinout status: +5 -0
According to 5 reports in our database (5 positive and 0 negative) the Serial (9 pin) port Loopback pinout should be correct.

Is this pinout
NO DIY devices
Serial (9 pin) port Loopback visual pinout:click to enlarge
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