EM500 Open-Loop Vector Control Inverter User Manual
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12. MODBUS Communication Protocol
1. Applicable series: EM500
2. Applicable network: Support MODBUS-RTU protocol, with the
single-master/multi-slave communication network of RS-485 bus.
12.2 Physical Interface
RS-485 asynchronous half-duplex communication mode is with the least significant
bit given the priority for transmittance.
RS-485 network address: 1 – 247 available for setting, 0 is the broadcast address.
RS-485 terminal default data format: 1-8-N-1
[2]
(1-8-E-1, 1-8-O-1, 1-8-N-2, 1-8-E-2
and 1-8-O-2, optional).
Default bit rate of RS-485 terminal: 9600 bps (4800 bps, 19200 bps, 38400 bps,
57600 bps and 115200 bps, optional);
It’s recommended to use shielded twisted cable as communication cable so as to
reduce impacts of external disturbance upon communication.
[2] 1-8-N-1, 1 start bit – 8 characters per byte data – nonparity 1 – 1 stop bit. E, even
parity; o, odd parity.
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