9.RS-485 INTERFACE (Communication protocol; Modbus-RTU)
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9. RS-485 INTERFACE
(Communication protocol; Modbus-RTU)
The RS-485 interface is used to read out the indicated value and the state of the
F320 and to write set values into the F320. It is convenient for connecting the
F320 with a PLC/programmable display, etc., to perform processing, such as
controlling, aggregating, and recording.
9-1. Communication Specifications
9-1-1. Standards
Signal level: Based on RS-485
Transmission distance: Approx. 1km
Transmission method: Asynchronous, half-duplex
Transmission speed: Selectable from 1200, 2400, 4800, 9600, 19200,
and 38400bps
Number of units connected: 32 at maximum(including one master)
Bit configuration: Start bit: 1 bit
Character length: Fixed at 8 bits
Stop bit: Fixed at 1 bit
Parity bit: Selectable from none,
odd, and even
RS-485 terminals
A- B+ S.G.
RS-485 signal ground terminal
B4 B5 B6
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