Mitsubishi Electric GT1685 Connection Manual page 748

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22. MULTI-CHANNEL FUNCTION
22.3 GOT Side Settings
3.
After writing down CH No., write down the communication driver name
for each connection type. For the communication drivers used for the
respective connection types, refer to the following.
* For the GT155 , setting is made only for Extension interface 1.
Chapters of each respective connection type