DB9-dat

• RS232-dat - RS485-dat

-	DB9	RS232	RS422	RS485
	1	DCD	T- = A+	DATA- = A+
	2	RX	T+ = B-	DATA+ = B-
	3	TX	R+ = A+	-
	4	DTR	R- = B-	-
	5	GND	GND	GND
	6	DSR	RTS-	-
	7	RTS	RTS+	-
	8	CTS	CTS+	-
	9	RI	CTS-	-
	10	-	-	-

sticker DB9 connector

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ref

• DB9