SIM7600 not responding to Arduino Mini

Projects General Guidance
1

I am working on a project which utilizes three components:

Arudino Pro Mini(5v)
Breakout SIM7600 A-H from AND technologies
9V Battery
I am trying to communicate through the device using the pins provided on the SIM board, which unfortunately is not successful.

I am able to connect to the board directly using an usb-c cable. After installing the right drivers, I am able to communicate with the board using AT commands from my Windows PC.

However, I want to be able to send AT commands through the arduino. The set up looks like this: I connect the following pins of arduino mini and SIM 7600A-H.

SIM 7600 TXD --> Arduino Pin 2
SIM 7600 RXD --> Arduino Pin 3
SIM 7600 Supply --> 5V
SIM 7600 GND --> GND
The code that I am using, I tried it with every possible baud rate:

#include <SoftwareSerial.h>

SoftwareSerial mySerial(2, 3); // RX, TX

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(115200);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }


  Serial.println("Goodnight moon!");

  // set the data rate for the SoftwareSerial port
  mySerial.begin(115200);
}

void loop() { // run over and over
  if (mySerial.available()) {
    Serial.write(mySerial.read());
  }
  if (Serial.available()) {
    mySerial.write(Serial.read());
  }
}

After sending an AT command, there is no response, the module has both LED's on, indicating that it is up and running.

2

SoftwareSerial library is best at 9600; maximum is 19200 if my memory is working.
Not sure what is the default baud rate of the SIM7600.

3

The device adopts to different baud rates(also 9600), I tried every possible baud rate. There was no response, not even gibberish which would indicate any kind of reaction.

4

Arduino supports baud rate up to 38400. You need to lower the baud rate of your SIM module to that rate or below with AT+IPREX command.