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Communication with meters and regulators by the Orbit Merret company

The Orbit Merret s.r.o. company (http://www.merret.cz, Czech republic) develops, manufactures, services and sells the digital manel measurement devices, converters and sensors.
 
The devices manufactured by the Orbit Merret support Modbus protocol communication 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 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:
- Parity: NO
- PLC OMC 8000 also supports the Modbus TCP/IP protocol.
- 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:
- 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)
 

Communication by ASCII protocol

For this communication in the PROMOTIC system can be used: PmChar - Driver for communication by user defined ASCII/BIN protocol.
For easy integration of this driver into the application it is handy to use:
PROMOTIC 8.3.19 SCADA system documentation - MICROSYS, spol. s r.o.

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