Serial port Loopback (9 CheckIt) pinout and wiring @ pinouts.ru

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at the computer

Used to verify that a port is working. This one works with CheckIt.

Name	Pin	Pin	Name
CD	1	6	DSR
CD	1	9	RI
RXD	2	3	TXD
DTR	4	6	DSR
RTS	7	8	CTS

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Pinouts.ru > Loopback pinouts and schemes listing > Pinout of Serial port Loopback (9 CheckIt) and layout of 9 pin D-SUB female connector

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loopback for testing

Serial port Loopback (9 CheckIt) pinout