9 pin to 9 pin null modem cable, used for connecting 9 pin serial devices to the serial port on a PC or laptop.
Can be used to connect 2 PCs serial ports to transfer data between. Also used to upload firmware / software updates to TV and satellite boxes etc.
1+6-4, 2-3, 3-2, 4-1+6, 5-5, 6+1-4, 7-8, 8-7
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