problem to use the SimpleModbusMaster library

Projects Networking, Protocols, and Devices
1

Hi guys, I'm following this thread to do the Modbus master on my arduino YUN:
http://forum.arduino.cc/index.php?PHPSESSID=2bn2bd9bjb5etai45g56dfpur4&topic=176142.0

but when I burn the program into the board this error comes out:

modbus_configure(&Serial, baud, SERIAL_8N2, timeout, polling, retry_count, TxEnablePin, packets, TOTAL_NO_OF_PACKETS);

cannot convert 'Serial_' to 'HardwareSerial' for argument '1' to 'void modbus_configure(HardwareSerial*, long int, unsigned char, unsigned int, unsigned int, unsigned char, unsigned char, Packet*, unsigned int)'

I don't quite understand this problem and how to solve it?

2

The AVR side of the Yun is an ATmega32U4, the same processor as the Leonardo has. On these Arduino types the "Serial" object is not a HardwareSerial class instance but connected to the USB serial emulation. Use the "Serial1" object there to access pins 0 and 1.

3

oh, I see it, thanks :slight_smile: :slight_smile:

4

Hi, everybody.
How I understood, in Arduino YUN it is impossible to realize data transmission under the Modbus protocol through USB (object of Serial)?
Not through Tx (0) and Rx (1) pins.