Pinouts >  Схемы кабелей для последовательных портов
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
На распиновку Заглушка для последовательного (9 pin) COM порта есть 4 отзыв(а): 4 положительных и 0 отрицательных.

Эта распиновка
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