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Modbus communication on a Uniflair unit.
Product line:
Uniflairl.
Environment:
All Models and Serial Numbers.
Cause:
Install.
Resolution:
MODBUS RTU
Scenario 1
Modbus is a communication protocol very famous and used all over the world. It’s quite easy and not so structured.
• It has been developed at the end of ’70 from Modicom
• The communication is multidrop, with Master and Slaves
• It is not used only with industrial application
• Serial communication: RS232 or RS485 half duplex
• Protocol type: Modbus RTU (1 byte = 2 exadecimal words) and Modbus ASCII (1 byte = 2 ASCII words).
Configurable Baud rate (max 19200)
The units, all fitted with the serial card, are connected:
• each unit with the RS485 cable;
• last unit with the final resistor;
• first unit with the Gateway.
To realize a local net to be connected to a BMS working with Modbus, it’s necessary:
• 1 gateway LBM every 16 units;
• 1 serial card RS485 for every controller;
• 1 terminal line (120 Ω);
• PC for the gateway configuration.
Scenario 2
Unites fitted with pCO1, upCOxs
To realize a local net to be connected to a BMS working with Modbus, it’s necessary:
• 1 RS485 serial card for every controller;
• 1 terminal line (120 Ω);
• PC for the gateway configuration.
Published for:APC Canada (French)
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