Please send me more details!
1 Addressing. One master on the network and other devices work as a slave? Is it just a combination of two devices?
2 The hardware layer. Connection of devices using the RS or the Ethernet standard, or whether the connection using the modem.
For standard RS422/485 connection to 1000 meters should work properly.
The radiomodem network should also check the radio connection, which can completely cut off communication.
The Modbus protocol is very robust, but can be affected by magnetic interference, cable length, unexpected cuts, etc. It is a bus that uses the application layer and the RS 485 protocol which makes it interoperable.
In one of my industrial applications I had a problem with the network Modbus working near the inverters and motors. Modbus was carried out on 485 standard. I deleted my network disturbance pulling cables from the zone in which work inverters. I made additional shielding cables with working Modbus network.
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