Toshiba AS311 user manual 3.2 RS-422 connection, Cable Connections

3. Cable Connections

3.2 RS-422 connection

The channel 1 can be selected either RS-232C or RS-422. The following figure shows the RS-422 connection.

AS311		Shielded cable	RS-422 device
1	FG		FG
10	TXDA		RXDA
21	TXDB		RXDB
11	RXDA		TXDA
22	RXDB		TXDB
7	SG		SG
12	RTSA		CTSA
23	RTSB		CTSB
13	CTSA		RTSA
24	CTSB		RTSB

R

R

(1)On the AS311, connect the built-in terminating resistors (120 Ω ) between RXDA and RXDB and between CTSA and CTSB by setting switches.

(Set the SW3-2 and SW3-3 to ON)

(2) On the RS-422 device, connect the terminating resistors R (120 Ω - 1/2 W) between RXDA and RXDB and between CTSA and CTSB.

(3)Connect SG each other.

(4)Use shielded twisted-pair cable. The A (+) and B (-) of the same signal should be paired.

(5)The cable shield should be connected to FG at one end.

NOTE	Do not connect or remove the connector while the AS311 is powered. Otherwise, it
	will cause damage to the AS311.

User’s Manual 21