Stulz C2020 - Modbus Stulz Protocol; Modbus Standard Protocol

EN/07.2013/58/71
6.3. Modbus Stulz protocol
In case of MODBUS STULZ PROTOCOL, the parameter M09 must be = 2.
In the system there is no gateway managing the communication.
There will be 2 kinds of connection in this system:
1. The connection between the RS485 serial port (named PRG) of two C2020 controllers;
2. The connection between the PRG port of a C2020 control board and the RS485 serial port of the host computer.
6.4. Modbus standard protocol
In case of MODBUS STANDARD, the parameter M09 must be = 4.
In the example below in shown a gateway BMS which manages the communication according to the ModBus protocol
specifications.
In the following table are shown the serial parameters for the ModBus communication.
Protocol: MODBUS-RTU
Baud Rate: 9600
Data Bits: 8
Parity: None
Stop Bits: 1
Flow control None
The controller doesn’t support broadcast message.
In the following tables it’s showed the relation between ModBus functions and the parameters of the application software.
The measurement units are °C for temperature and bar for pressure.
RS232
Serial line
RS485
Serial line
Gateway BMS
C2020
Controller
PRG SPI
ACTSERC1010
C2020
Controller
PRG SPI
Ethernet
ACTSERC1010