Null Modem Cable

RS232 Serial Communications Cable
MALE cable plug mates with CNC DB25 Pin Male Connector					FEMALE cable plug mates with PC DB9 pin Female Connector
DB25 pin	signal				DB9 pin	signal
2	TX		»		2	RX
3	RX		«		3	TX
7	GND		-		5	GND
4	RTS	jumpered		jumpered	1	DTR
5	CTS				4	DCD
6	DSR	jumpered			6	DSR
8	DCD				8	CTS
20	DTR

Note:

1. Only 3 RS232 wires are needed in the cable - recommend 24AWG shielded cable.
2. The jumpered pins 1,4,6,8 on PC, and 4,5 and 6,8,20 on CNC are shorted together inside their respective connector shells.
3. Set CNC and PC to use XON/XOFF protocol NOT hardware handshaking.

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