Communication Protocol
SiOne Page
15
ADR
- (one byte – 8 bits)
- Device address
FUNC - (one byte – 8 bits)
- MODBUS function
DAT1..n - (n bytes – 8*n bits)
- Read data or data for writing
CRC16 - (2 bytes – 16 bits)
- CRC
MODBUS Function
The device has the following functions for reading and writing data (please look at Table no. 4). In addition to the standard
MODBUS RTU functions, additional functions have been implemented in the device, including program reset, factory reset,
device name and version readout.
Function address
Description
0x01
HEX
Read single bit
0x03
HEX
Read n internal registers (configuration parameters)
0x04
HEX
Read n input registers (measuring data and status register)
0x05
HEX
Write single bit
0x06
HEX
Write single register (16 bits)
0x10
HEX
Write n registers (16*n bits)
0x60
HEX
The device reset
0x61
HEX
Reset to factory settings
0x62
HEX
The device name and version readout
Table 4. MODBUS RTU Function
