Serial Gear

DIP switch settings

	Operation Mode	S1	S2	S3	S4
RS-232	Standard RS242 Mode	Off	On	On	On
RS-422	4 Wire with handshaking	On	On	On	On
RS485	Full Duplex (4 wire)	On	Off	On	On
	Half Duplex (2 wire) with echo	On	Off	Off	On
	Half Duplex(2 wire) without echo	On	Off	Off	Off

Pins	RS232		RS422		RS485
Pins	DB-9	Terminal Blocks	DB-9	Terminal Blocks	DB-9	Terminal Blocks
Pin 1	DCD	DCD	Tx-(A)	Tx-(A)	Tx-(A)	Tx-(A)
Pin 2	RxD	RXD	Tx+(B)	Tx+(B)	Tx+(B)	Tx+(B)
Pin 3	TxD	TXD	Rx+(B)	Rx+(B)	Rx+(B)	Rx+(B)
Pin 4	DTR	DTR	Rx-(A)	Rx-(A)	Rx-(A)	Rx-(A)
Pin 5	GND	+5V	GND	+5V	GND	+5V
Pin 6	DSR	GND	RTS-(A)	GND	N/A	GND
Pin 7	RTS	N/A	RTS+(B)	N/A	N/A	N/A
Pin 8	CTS	N/A	CTS+(B)	N/A	N/A	N/A
Pin 9	RI	N/A	CTS-(A)	N/A	N/A	N/A