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ASCII Interface Module (AS311)
1. AS311 Overview
SW3
RS-232C/RS-422 selection switches (for channel 1)
RSW1/RSW2
Optional rotary switches
SW3
ON
→
3
2
1
Used to select the interface of the channel 1 either
RS-232C or RS-422.
No.1
OFF ON
Interface RS-232C RS-422
Used to connect the terminating resistor (120 Ω)
between RXDA and RXDB. (Effective for RS-422)
No.2
OFF ON
Terminating Not connect Connect
Used to connect the terminating resistor (120 Ω)
between CTSA and CTSB. (Effective for RS-422)
No.3
OFF ON
Terminating Not connect Connect
NOTE
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.
RSW2
RSW1
C
4
80
C
4
80
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.