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1. AS311 Overview
SW3
RS-232C/RS-422 selection switches (for channel 1)
1
2
3
NOTE
RSW1/RSW2
RSW1
RSW2
12
ASCII Interface Module (AS311)
Used to select the interface of the channel 1 either
RS-232C or RS-422.
No.1
Interface
Used to connect the terminating resistor (120
between RXDA and RXDB. (Effective for RS-422)
ON
No.2
Terminating
SW3
Used to connect the terminating resistor (120
between CTSA and CTSB. (Effective for RS-422)
No.3
Terminating
The switches No.2 and No.3 should be set to ON when the AS311
is configured as terminal station on the RS-422 transmission line.
The factory settings of the SW3 are all OFF.
Optional rotary switches
C
8
0
4
C
8
0
4
RS-232C
Not connect
Not connect
Always set the RSW1 to 4 and the RSW2 to 0.
(Other settings are for future use)
Do not set other than above, otherwise the AS311
will not work correctly.
OFF
ON
RS-422
OFF
ON
Connect
OFF
ON
Connect
)
)
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