readCoils()
描述
向 Slave 節點發送讀取 Coils 暫存器的封包指令。
語法
node1.readCoils(read_address, read_size)
參數
node1
: ModbusMasterNode
物件。
read_address
:欲讀取的 Coils 暫存器之起始位址。
read_size
:欲讀取的 Coils 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; 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
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.