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SSB 6720892984 (2019/02) US
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Appendix K - Modbus
K .1 Modbus Configuration
The table below summarizes the Modbus configuration details.
Protocol Modbus RTU.
Default dependent address
Configurable with 900PB or LabVision.
Default: 1
Supported Modbus commands
Read Holding registers (03)
Write single holding register (06)
Write multiple holding registers (10)
Baud rate 9600 bps.
Data Length 8
Parity None
Stop Bits
1/2, Configurable with 900PB or LabVision.
Default: 2 stop bits
Physical layer RS485 (two wire + optional GND)
K .2 Holding registers
Depending on the type of Modbus software used, the holding register addressing range starts either at 0x0000 or at 0x0001.
If your Modbus software starts addressing from 0x0000 you can use the holding register addresses shown in the table above.
If your Modbus software addressing range starts at 0x0001 then add 1 to the holding register addresses listed in the table above. This is also applicable
for the various test tools available for Modbus.
Holding registers that support writing can only be written to when writing is enabled.
Writing can be enabled by setting the ‘Write enable’ bit in the ‘Control register’ (Also see chapter “K.4 Control register” and “K.4.1 Write Enable”).
K .3 Overview
K .3 .1 General Modbus Control/Status registers (95 - 99)
Depending on the type of Modbus software used, the holding register addressing range starts either at 0x0000 or at 0x0001.
Holding
register
Access
Description
Automatic
Conversion
Range
R W
General Modbus Control/Status registers
95 005F X Group number 850 / 900
97 0061 X Modbus Device type / table 20 = 900PB
98 0062 X X
Unit selection
(see paragraph “K.5 Unit selection” pag. 71 for more details)
Bit0: °C / °F
Bit1: bar / psi
99 0063 X X
Control register
(see paragraph “K.4 Control register” pag. 71 for more details)
Bit0: Write Enable.
Bit14: Controller reset.