ArduinoModbus - client.requestFrom()
Description
Read multiple coils, discrete inputs, holding registers, or input register values.
Use available() and read() to process the read values.
Syntax
int requestFrom(int type, int address, int nb);
int requestFrom(int id, int type, int address,int nb);
Parameters
- id (slave) - id of target, defaults to 0x00 if not specified
- type - type of read to perform, either
- COILS (FC 0x01)
- DISCRETE_INPUTS (FC 0x02)
- HOLDING_REGISTERS (FC 0x03)
- INPUT_REGISTERS (FC 0x04)
- address start address to use for operation
- nb - number of values to read
Returns
0 on failure, number of values read on success