An LED in the casing can be operated via an external control contact.
The button can be put out of operation.
The voltage must be in the range of 115 through 230 VAC:
Attach the serial cable directly to the connector labeled "com" on the ....
Use a straight-through cable.
Use a crossed cable.
All the EMC limits standardized within Europe are of course also met.
Wire is stranded into cable to carry electricity.
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