Communication with meters and regulators by the Orbit Merret company
The Orbit Merret s.r.o.
, Czechia) develops, manufactures, services and sells the digital manel measurement devices, converters and sensors.
The devices manufactured by the Orbit Merret
support communication by the Modbus
protocol or a simple ASCII
protocol. This goes, for example, for the following devices:
- PLC OMC 8000
- Multifunction input OM 402/502/602 with 4/5/6-character display
- 4-character universal PID regulator OM 402PID
Communication by Modbus protocol
For this communication in the PROMOTIC system can be used: PmModbusMr - Driver for communication by the Modbus Master protocol
For easy integration of this driver into the application it is handy to use:
- The listed devices support Modbus RTU
protocol with default communication parameters:
- The whole shared memory is separated into holding registers 4xxxx
with following addressing:
Register 40001 corresponds to address 0000 in command and in shared memory.
Register 40002 corresponds to address 0001 in command a to address %MW3.2 in shared memory.
Register 40003 corresponds to address 0002 in command a to address %MW3.4 in shared memory. etc.
- The data can be read/written by thefollowing Modbus
- Functions for reading:
03-Read Holding Registers (Read Output Registers)
- Functions for writing:
06-Preset Single Register (Write 1 Register)
16-Preset Multiple Registers (Write n Registers)