PIC-Modbus-RTU-Slave

PIC18F4520 Modbus RTU as Slave - Led Blink - Read Write Registers

Project tested with PIC18F4520, compiler CCS and Python 3.7

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Extra Components for Modbus Communication:

TTL to USB : https://www.robolinkmarket.com/usb-rs485-donusturucu-modul

RS485 to TTL : https://www.robolinkmarket.com/rs485-ttl-seri-donusturucu-karti

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Wiring for RS485 Modules and LCD :

DE and RE pins shorted ->D2

DI -> TX

RO -> RX

A->A

B->B

LCD_D4 -> PIN_B4

LCD_D5 -> PIN_B5

LCD_D6 -> PIN_B6

LCD_D7 -> PIN_B7

LCD_RS -> PIN_B3

LCD_RW -> PIN_B2

LCD_E -> PIN_B1

LED -> PIN_C4

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Supported Functions:

3 : Read holding register

6 : Write single register

15: Write multiple registers

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Serial Port Settings:

Baudrate: 9600

Data Bit: 8

Parity Bit: Even

Stop Bit: 1

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