2 SERIAL COMMUNICATION MODULE REPLACEMENT
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The following shows the precautions relating to Q series serial communication modules when A/AnS/
QnA/QnAS series programmable controllers are replaced with Q series programmable controllers.
(1) About processing time
The processing time for data communications differs between the A/AnS/QnAQnAS and Q series
modules.
For this reason, some data communications timing may be also different. If necessary, adjust the timing
by inserting a wait time, for example.
For actual details on processing times, refer to the manual for the respective module.
(2) About switch settings
When using a Q series serial communication module, be sure to set the operation mode, station number
and transmission specifications in the following parameter setting screen on GX Developer.
• "Switch setting for intelligent function module" screen
The Q series serial communication module does not have setting switches for setting the mode setting,
station number setting and transmission specifications setting.
(3) About the RS-422 interface
Q series communication modules do not have the connector specifications RS-422 interface (CH1) that
is available on the QnA series communication module AJ71QC24N-R4.
Use the RS-232 interface or terminal block specifications RS-422/485 interface to connect to external
devices.
(4) About data communications on the RS-422/485 interface
The precautions during data communications on the RS-422/485 interface are the same as when a
QnA/QnAS series serial communication module is used. When external devices may receive the wrong
data, attach a pullup/pulldown transistor on the external device side.
2.7 Other Precaution
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