USER MANUAL – S203TA-D / S203RC-D
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The default configuration for RS485 port is:
Modbus station address: 1
baud rate: 38400 baud
parity: none
data bit: 8
stop bit: 1
Please note that the device must reboot after any modification to the RS485 communication parameters to
work properly.
The configuration for USB port is fixed and not configurable:
Modbus station address: 1
baud rate: 38400 baud
parity: none
data bit: 8
stop bit: 1
9.1.
Modbus RTU protocol
All registers are “Holding register” (Read Modbus function 3) with the convention that the first register is
the 40001 address.
The following Modbus functions are supported:
Read Single Modbus Register (function 3)
Write Single Modbus Register (function 6)
Write Multiple Modbus Registers (function 16)
All values in 32bits are stored into 2 consecutive registers, for example:
VRMS A in floating point 32 bits is stored into registers 40135 and 40136, the Most significant word is the
register 40135, the less significant word is the 40136.
So the 32bits value is obtained by the following relation:
𝑉𝑅𝑀𝑆 𝐴 = 𝑅𝑒𝑔40136 + (𝑅𝑒𝑔40135 × 2
16
) = 𝑅𝑒𝑔40136 + (𝑅𝑒𝑔40135 × 65536)