我正在尝试使用 Arduino Mega 从能量计(型号:ELITE 100,品牌:SECURE)读取 4 个寄存器。我使用 RS 485 转 TTL 模块让 arduino 与电能表进行通信。上传代码后,在串行监视器中我看到arduino无法与电能表通信,并显示十六进制格式的响应代码是“E2”。我无法理解真正的问题是什么。请帮助我。
电能表MODBUS注册链接:https://drive.google.com/drive/folders/1kTQg0wvcX-iG7jkeZHwIUkK8e-9VVVW_?usp=sharing
一些设置值是: 奇偶校验位:无,波特率:9600,停止位:1
代码输出为:
Failed, Response Code: E2
#include<ModbusMaster.h>
/* DI = UNO / NANO TX PIN / arduino mega pin 1 TX pin
RO = UNO/ NANO RX PIN / arduino mega pin 0 RX Pin
*/
#define MAX485_DE 3
#define MAX485_RE_NEG 2
ModbusMaster node;
void preTransmission() {
digitalWrite(MAX485_RE_NEG, 1);
digitalWrite(MAX485_DE, 1);
}
void postTransmission()
{
digitalWrite(MAX485_RE_NEG, 0);
digitalWrite(MAX485_DE, 0);
}
void setup() {
pinMode(MAX485_RE_NEG, OUTPUT);
pinMode(MAX485_DE, OUTPUT);
// Init in receive mode
digitalWrite(MAX485_RE_NEG, 0);
digitalWrite(MAX485_DE, 0);
Serial.begin(9600, SERIAL_8N1);
//slave ID 1
node.begin(1, Serial);
Serial.println("Starting Modbus Transaction:");
node.preTransmission(preTransmission);
node.postTransmission(postTransmission);
}
uint16_t newData = 0;
float floatData;
double dataOne;
void loop() { // loop starts from here.
static uint32_t i;
uint8_t j, result;
uint16_t data[10];
i++;
result = node.readHoldingRegisters(40172, 2); // read holding registars
Serial.println(" ");
/*
if (result == node.ku8MBSuccess) {
Serial.print("\nSuccess, Received data 0: ");
for (j = 0; j < 2; j++) { // THIS FUNCTION READ SINGLE REGISTAR
data[j] = node.getResponseBuffer(j);
floatData, dataOne = node.getResponseBuffer(j);
Serial.print("\nHex data:");
Serial.print(data[j], HEX);
Serial.print(" ");
Serial.print("\nDec data:");
Serial.print(data[j], DEC);
Serial.print("\nfloat data:");
Serial.print(floatData);
*/
if (result == node.ku8MBSuccess) {
Serial.print("\nSuccess, Received data 0: ");
for (j = 0; j < 2; j++) {
data[j] = node.getResponseBuffer(j);
}
unsigned long temp = (unsigned long)data[0] + (unsigned long)data[1] * 65536;
floatData = *((float*)&temp);
Serial.print(floatData);
}
//}
//}
else {
Serial.print("Failed, Response Code: ");
Serial.print(result, HEX);
Serial.println(" ");
delay(5000); // 5000
}
delay(1000);
}
如果您想获取链接中提到的保持寄存器的值:https://drive.google.com/drive/folders/1kTQg0wvcX-iG7jkeZHwIUkK8e-9VVVW_?usp=sharing
读取V1:R相到中性线电压在初始地址中减1意味着 40100 - 1 = 40099 并仅将 99 传递给代码 Ex。节点.readHoldingRegisters(99, 2)
希望它有效,也感谢Brits