Toshiba AS311 User Manual page 23

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
1 FG
10 TXDA
21 TXDB
11 RXDA
22 RXDB
7 SG
12 RTSA
23 RTSB
13 CTSA
24 CTSB
(1) On the AS311, connect the built-in terminating resistors (120
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
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.
Shielded cable
3. Cable Connections
RS-422 device
FG
RXDA
RXDB
TXDA
TXDB
SG
CTSA
CTSB
RTSA
RTSB
) between RXDA
- 1/2 W)
21
User's Manual
R
R