Hi folks,
I am trying to communicate with a solar inverter that expects a query string[14] like this:
F2FE1212D6E91B0000400008CF65
The sketch below starts normally (altough not yet receiving any correct answer) but I was surprised to notice it appears to start sending a different string after a while. Follows part of the Serial Monitor log as an image to prevent non-readable codes interference:
At 14:40:14.328 it sent the query message OK as shown in Hexa and ASCII in following line. It got no answer at all and imediately printed the five values supposedly calculated with the unreceived answer.
About five seconds after Tmp print it queried again at 14:40:19.375 in Hex and some millis after in ASCII acompanied by two repetitions of query wich I don't know how they appeared. Anyway, the query message is still ok.
Some 100 ms later it seems to get an answer (wrong again) and the five computed values.
Then, at 14:40:24.546 I was surprised by a modified "constant" message! The four initial bytes are correct but from fifth on they got corrupted. Can a variable declared as a constant change its value? Prior versions of the sketch used just a byte array, I changed to a const byte array precisely to avoid any change.
Of course there are other issues yet wit my code, but if I can't keep at least the query message fix I'll be in deep trouble.
I'd greatly appreciate any help, follows my sketch.
Inicializa duas portas seriais, a do monitor e a do HC-12 nas linhas 2(RX) e 3(TX);
A cada 10 segundos envia a mensagem F2 FE 12 12 D6 E9 1B 00 00 40 00 08 CF 65 pelo
monitor junto com minha assinatura, em seguida manda a mesma mensagem pelo HC-12
e aguarda resposta durante 20 mseg.
*/
#include <SoftwareSerial.h>
SoftwareSerial HC12Serial(2, 3); //RX, TX
void setup()
{
// initialize both serial ports:
Serial.begin(9600); //monitor
HC12Serial.begin(9600); //HC12
HC12Serial.setTimeout(1000);
}
void loop() // <------sent msg echo------->
{ // F2FE1212D6E91B0000400008CF65<-------received data------>
byte rcvd[] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; // 28 bytes
word data[7];// 0E01597402B7406B000008F414B4 7 16-bit words
bool flag = false;// Vdc,Vac,Adc,<-Wx10-->Wac,Tmp
int i;
const byte message[] = {0xF2, 0xFE, 0x12, 0x12, 0xD6, 0xE9, 0x1B, 0x00, 0x00, 0x40, 0x00, 0x08, 0xCF, 0x65};
for (i = 0; i < 14; i++) {Serial.print(message[i], HEX); Serial.print(" ");}; Serial.println();
Serial.write(message, sizeof(message)); Serial.println();
HC12Serial.write(message, sizeof(message));
//delay(100); //delay to allow host procesing
if (HC12Serial.available())
{
HC12Serial.readBytes(rcvd,28);
for (i = 0; i < 28; i++) {Serial.print(rcvd[i], HEX); Serial.print(" ");};
Serial.println();
for(i=14; i<28; i=i+2) {data[i]=256*rcvd[i]+rcvd[i+1]; Serial.print(data[i]); Serial.print(" ");};
Serial.println();
}
float Vdc=1.0*data[0]/100;
float Vac=1.0*data[1]/100;
float Adc=1.0*data[2]/100;
float Wh =10.0*data[3];
float Wac=1.0*data[5]/10;
float Tmp=data[6]/100;
float Aac=Wac/Vac;
float Wdc=Vdc*Adc;
float Eff=100*Wac/Wdc;
Serial.print("Vdc="); Serial.println(Vdc);
Serial.print("Vac="); Serial.println(Vac);
Serial.print("Adc="); Serial.println(Adc);
Serial.print("Eff="); Serial.println(Eff);
Serial.print("Tmp="); Serial.println(Tmp);
delay(5000);
}
