12 MODBUS RTU
The S200 measurement and control device is equipped with a Modbus RTU interface.
This piece of equipment has an RS 485 interface.
Shielding = Terminal 97
A = + Terminal 96
B = - Terminal 95
12.1 Shielding
The use of shielded cables provides high protection against electromagnetic interference,
especially high frequencies. However, the effectiveness of the shield depends on the careful
installation of the cable.
The shielding is located near the main ModBus.
12.2 Communication parameters
Transmission speed: 9,600 bps
Data bits: 8
Start-up bits: 1
Shutdown bits: 1
Parity: none
12.3 MODBUS functions used
The following MODBUS functions are used:
• 04 (0x04) Querying registry values - max. reading 40 registers
• 06 (0x06) Single registry writing - writing 1 register.
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