Pinouts of Connectors

Serial Port Loopback (25 CheckIt) pinout

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

25 pin D-SUB FEMALE connector pin-out & layout
25 pin D-SUB FEMALE connector  to the computer
Name Pin Pin Pin Pin
Jumpering 1 2 3    
Jumpering 2 4 5    
Jumpering 3 6 8 20 22

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Pinouts.ru > Pinouts of Loopbacks >  Pinout of Serial Port Loopback (25 CheckIt) and layout of 25 pin D-SUB FEMALE connector

Source(s): Hardware Book, "Coolsys"
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