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2
SERIAL COMMUNICATION MODULE REPLACEMENT
2.7 Other Precautions
This section describes other precautions for module replacement.
(1) Processing time
The processing time for data communications differs between the AnS/QnAS series and L series
modules.
For this reason, some data communications timing may be also different. Adjust the timing by inserting a
waiting time, as needed.
For details on processing time, refer to the manual for the module used.
(2) Switch settings
To use L series serial communication modules, set the operation mode, station number, and
transmission specifications in the following parameter setting window using GX Developer:
• "Switch setting for intelligent function module" window
The L series serial communication modules do not have switches for setting the mode, station number,
and transmission specifications.
(3) Data communications via RS-422/485 interface
The precautions for data communications via RS-422/485 interface are the same as those for the QnAS
series serial communication modules.
If external devices may receive the wrong data, attach a pullup/pulldown transistor to the external
devices.
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