readHoldingRegisters()

描述

向 Slave 節點發送讀取 Holding Registers 暫存器的封包指令。

語法


node1.readHoldingRegisters(read_address, read_size)


參數

node1： ModbusMasterNode 物件。

read_address：欲讀取的 Holding Registers 暫存器之起始位址。

read_size：欲讀取的 Holding Registers 暫存器之大小。

回傳

int：如果成功回傳 MODBUS_SUCCESS，反之回傳 EXCEPTION_CODE 。

範例

#include <Modbus86.h>
 
ModbusMaster bus1;
ModbusMasterNode node1;

uint8_t result;
uint32_t receiveData;

void setup()
{
	while(!Serial);
	Serial1.begin(115200);
	bus1.begin(MODBUS_RTU, Serial1);
	node1.attach(16, bus1);
	
	result = node1.readHoldingRegisters(5, 2);
	
	if (result != MODBUS_SUCCESS) {
		Serial.print("readHoldingRegisters => ErrorCode: ");
		Serial.println(result);
	} else {
		Serial.print("From Holding Register receiveData: ");
		receiveData = node1.getResponseBuffer(0)
					| (node1.getResponseBuffer(1) << 16);
		Serial.println(receiveData);
	}
}
 
void loop()
{
}

See Also

－ getResponseBuffer()

函式庫參考主頁面

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.