Modbus-rtu (over rs-485), Wiring pinout, Modbus setup – Hardy HI 6300 Series User Manual
Page 39: Wiring pinout modbus setup

Network Configuration 31
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Modbus-RTU (over RS-485)
Step 1. Setup a slave address assigned to the HI 6300 series instrument from the
communications menu and the Modbus-RTU submenu.. Use a unique address
between 1 and 247
Step 2. Set the Baud Rate to the same as the master device, typically 9600 or 19,200
Step 3. Set the Parity Bit parameter to match that of the Modbus-RTU master (EVEN,
ODD, or OFF)
Wiring Pinout
The RS 485 serial port pinout is:
Modbus Setup
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Slave Address may be set to any number in the range of 1-247.
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Set Baud Rate parameter to match the settings of the Modbus master
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Set Parity to match the settings of the Modbus master
Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
Ground
TX+
TX-
RX+
RX-
Shield