M5 RS485 Modbus slave sample code does not compile

[LukeS]

I have an Atom Switch that I want to use RS485 modbus with has not modbus sample code. So I trying to use sample code from the ATOM DTU devices.

When I try to compile the sample code it gives the following error

error: no matching function for call to 'RS485Class::RS485Class(HardwareSerial&, int, int, int, int)'
 RS485Class RS485(Serial2, ATOM_DTU_RS485_RX, ATOM_DTU_RS485_TX, -1, -1);

Which makes sense as I don't understand where the RS485Class is defined or how it is in the below code sample. Has anyone got this working?

#include <M5Atom.h>
#include <ArduinoModbus.h>
#include <ArduinoRS485.h>
#include "ATOM_DTU_NB.h"

const int numCoils            = 10;
const int numDiscreteInputs   = 10;
const int numHoldingRegisters = 10;
const int numInputRegisters   = 10;

RS485Class RS485(Serial2, ATOM_DTU_RS485_RX, ATOM_DTU_RS485_TX, -1, -1);

[ajb2k3]

Have you downloaded and installed all the libraries required in arduino?

[LukeS]

@ajb2k3 yup, all the libraries in the include section are downloaded and the compiler does not throw any missing file errors

[robertoubeperuzzo]

I'm having the same problem testing a similar example in https://github.com/m5stack/ATOM_DTU_LoRaWAN/blob/master/examples/Modbus/ModBus-RTU/Slave/Slave.ino

Does anyone have a working example to share?