readWriteMultipleRegisters()
描述
向 Slave 節點發送讀寫 Holding Registers 暫存器的封包指令。
語法
node1.readWriteMultipleRegisters(read_address, read_size, write_address, write_size)
node2.readWriteMultipleRegisters(read_address, read_size)
- 參數所搭配的函式與使用方法不同,詳見範例以示說明。
參數
node1/node2
: 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。
write_address
:欲寫入的 Holding Registers 暫存器之起始位址。
write_size
:欲寫入的 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 <Arduino.h> #include <Modbus86.h> ModbusMaster bus1; ModbusMasterNode node1; uint8_t reg[2]; uint8_t result; uint32_t receiveData; void setup() { while(!Serial); Serial1.begin(115200); bus1.begin(MODBUS_RTU, Serial1); node1.attach(16, bus1); reg[0] = 0x1234; reg[1] = 0xabcd; node1.setTransmitBuffer(0, reg[0], MODBUS_DATAMODE_UINT16); node1.setTransmitBuffer(1, reg[1], MODBUS_DATAMODE_UINT16); result = node1.readWriteMultipleRegisters(5, 2, 10, 2); if (result != MODBUS_SUCCESS) { Serial.print("readWriteMultipleRegisters => ErrorCode: "); Serial.println(result); } else { Serial.print("From Holding Register receiveData: "); receiveData = node1.getResponseBuffer(0) | (node1.getResponseBuffer(1) << 16); Serial.println(receiveData); } } void loop() { }
#include <Arduino.h> #include <Modbus86.h> ModbusMaster bus1; ModbusMasterNode node2; uint8_t reg[2]; uint8_t result; uint32_t receiveData; void setup() { while(!Serial); bus1.begin(MODBUS_RTU,Serial1); node2.attach(16, bus1); reg[0] = 0x1234; reg[1] = 0xabcd; node2.beginTransmission(10); node2.send(reg[0]); node2.send(reg[1]); result = node2.readWriteMultipleRegisters(5, 2); if (result != MODBUS_SUCCESS) { Serial.print("readWriteMultipleRegisters => ErrorCode: "); Serial.println(result); } else { Serial.print("From Holding Register receiveData: "); receiveData = node2.getResponseBuffer(0) | (node2.getResponseBuffer(1) << 16); Serial.println(receiveData); } } void loop() { }
See Also
- setTransmitBuffer()
- beginTransmission()
- send()
- getResponseBuffer()
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.