modbus_lte_modem

#define RXD1 32
#define TXD1 25
#define EN_MODBUS 33
#define serialModbus Serial1

#define RXD2 17
#define TXD2 16
#define PKEY 5
#define RST 4
#define serialLTE Serial2

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  serialModbus.begin(9600, SERIAL_8N1, RXD1, TXD1);
  serialLTE.begin(9600, SERIAL_8N1, RXD2, TXD2);

  pinMode(EN_MODBUS, OUTPUT);
  pinMode(RST, OUTPUT);
  pinMode(PKEY, OUTPUT);

  digitalWrite(PKEY, LOW);
  digitalWrite(RST, HIGH);delay(1000);
  digitalWrite(RST, LOW);delay(1000);
  digitalWrite(RST, HIGH);delay(1000);
  digitalWrite(EN_MODBUS, HIGH);delay(1000);
}

void loop() {
  // put your main code here, to run repeatedly:

}