Serial communication with a slave board

Development Other Hardware Development
1

Hello Guys,

I have a board that is analyzing a modulator and is controlled with computer by opening a port (baud-rate: 19200). It is connected to a computer by a mini usb cable, and has an interface (I use Tera Term for opening a port), such as you can set the voltage limits it should give by writing "vmin 05.00" to the serial port.

It works fine when I change the features through computer connection or using MATLAB to read and write the data. However, when I try using an Arduino Nano to send serial data it fails. Such as using the code below;

void setup() {
  Serial.begin(19200);
  delay(1000);

  Serial.println(4);
  delay(100);
  Serial.println("VMIN 0");
  delay(100);
  Serial.println("VMAX 11");
  delay(100);
}

I believe that is caused by trying a slave to slave connection. So somehow I guess I should make Arduino master. So far, I tried connecting a PL2303 to the board, PL2303's Rx, Tx, Power, Gnd connections are made with Arduino. I also tried connecting both directly by cable using a usb to mini usb converter.
.
I ask for your help on how can I make them communicate with each other.

Thanks in advance.

2

It's probably an error in the part of the code that is missing.Are you using the software serial in the Nano program? I understand it can't function at the speed you posted.

Paul