ArduinoModbus : Modbus Client class
Read multiple coils, discrete inputs, holding registers, or input register values.
Use available() and read() to process the read values.
int requestFrom(int type, int address, int nb);
int requestFrom(int id, int type, int address,int nb);
id (slave) - id of target, defaults to 0x00 if not specified
type - type of read to perform, either COILS, DISCRETE_INPUTS, HOLD_REGISTERS, or INPUT_REGISTERS
address - start address to use for operation
nb - number of values to read
0 on failure, number of values read on success
ModbusClient Class
