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I am trying to have an ABB AC800M with a Modbus TCP card (CI867) communicate, through a 3G router, with a remote MOXA W5340-HSDPA I/O with build in 3G modem.
We have found the problem and it’s the "Unit Identifier" address that doesn't match between AC800M and the remote MOXA I/O. The remote MOXA I/O is listening on unit ID 0 or 1 and AC800 use 255.
In the manual "Modbus_Messaging_Implementation_Guide_V1_0b.pdf", on page 23, it says that 255 is the value to be used.
MOXA says that it is wrong to use 255 and the value 0 or 1 should be used.
What is correct?
(It is not possible to change the Unit ID in either ABB nor MOXA)
I'm also a little confused when reading the note about the UnitID in the manual. Would it be possible to get a more extensive explanation of that part?
We have found the problem and it’s the "Unit Identifier" address that doesn't match between AC800M and the remote MOXA I/O. The remote MOXA I/O is listening on unit ID 0 or 1 and AC800 use 255.
In the manual "Modbus_Messaging_Implementation_Guide_V1_0b.pdf", on page 23, it says that 255 is the value to be used.
MOXA says that it is wrong to use 255 and the value 0 or 1 should be used.
What is correct?
(It is not possible to change the Unit ID in either ABB nor MOXA)
I'm also a little confused when reading the note about the UnitID in the manual. Would it be possible to get a more extensive explanation of that part?