It will then use packet2 to write a register (its own adc ch0 value) to address 1
Labview modbus serial example arduino code#
The motivation is to read temperatures from multiple Ds18b20 temperature sensors, however be able to modify easily the code to control relays, read analog inputs etc. It will then use this value to adjust the brightness In this post, I will try to describe an approach of LabVIEW/Arduino communication using Modbus protocol. The example will use packet1 to read a register from address 0 (the adc ch0 value)įrom the arduino slave (id=1). The code for the Arduino master #include
RS485 Shield from joy-it with jumpers at (RX = D0, TX = D1, TX_CTRL and 5V).Arduino w5100 Shield (will be used so send the data to an server, i will be working on that after the modbus connection is done).The ttl signal will be read to labview (tested and working at other projects and "test"commands).Īnyone who can help me with reading the register, or receiving the data if that’s the problem? So ain’t sure if i receive some data.įor trying to read the (read) register i used the code: mySerial.write(regs) įor the monitoring of the mySerial i used an serial to ttl converted cause the RS485 uses the TX and RX, so i won’t be able to use the Serial monitor over usb cause that chips used the serial port (pin TX and RX) as far of my ankowledge. I can see the TX and RX indication leds blink while connected to the slave, and RX doesn’t blink while not connected. As far as i know i receive some data, or atleast have an connection with the slave. I"m trying to receive data and use the received data.
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