This program responds to any Device ID from 1 through 255. Device ID zero (0) is a broadcast address and any requests to this address create no responses. This is the reason that there is no input needed for this parameter. The bottom of the display shows which device is asking for data and you can go to the "Comms" display to see the Device ID. I normally consider this a feature, rather than a bug. Thanks.
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Several PLC use address 0 to receive their request. It is not correct to deactivate address 0 by programming. Especially since it is already possible with the bottom bar.
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Patrick,
Address 0 is not deactivated, but receives and processes requests. It just is prohibited from sending a response because of its slave status that address 0 is a broadcast address for all listening slaves. If more than one responded, this would be very confusing in general. Thanks.
Doug Lyons
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I figured it out, thanks for the reply
This program responds to any Device ID from 1 through 255. Device ID zero (0) is a broadcast address and any requests to this address create no responses. This is the reason that there is no input needed for this parameter. The bottom of the display shows which device is asking for data and you can go to the "Comms" display to see the Device ID. I normally consider this a feature, rather than a bug. Thanks.
Several PLC use address 0 to receive their request. It is not correct to deactivate address 0 by programming. Especially since it is already possible with the bottom bar.
Patrick,
Address 0 is not deactivated, but receives and processes requests. It just is prohibited from sending a response because of its slave status that address 0 is a broadcast address for all listening slaves. If more than one responded, this would be very confusing in general. Thanks.
Doug Lyons
Closing now.