[Modbus]
Description
Send a packet read command to the Slave node to read the Coils register.
Syntax
node1.readCoils(read_address, read_size)
Parameters
node1
: ModbusMasterNode object.read_address
: The starting address of the Coils register to be read.read_size
: Size of the Coils register to be read.
Returns
Int: If it succeeds, send back MODBUS_SUCCESS and vice versa, send back EXCEPTION_CODE.
Example
#include <Modbus86.h> ModbusMaster bus1; ModbusMasterNode node1; uint8_t result; void setup() { while(!Serial); Serial1.begin(115200); bus1.begin(MODBUS_RTU, Serial1); node1.attach(16, bus1); result = node1.readCoils(5, 2); if (result != MODBUS_SUCCESS) { Serial.print("readCoils => ErrorCode: "); Serial.println(result); } else { Serial.print("From Coil Status receiveData: "); Serial.print(node1.getResponseBuffer(0, MODBUS_DATAMODE_BIT)); Serial.print(", "); Serial.println(node1.getResponseBuffer(1, MODBUS_DATAMODE_BIT)); } } void loop() {}
See Also
Libraries Reference Home
The text of the 86Duino reference is a modification of the Arduino reference and is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.