RS232 to UART Converter.

i have max 2323 device rs232 port connected gps device , ttl output uart 2 of arduino mega.

i'm using sketch simple test ensure data coming in:

void setup() {
  // initialize both serial ports:
  serial.begin(9600);
  serial2.begin(4800, serial_8n1);
}

void loop() {
  // read port 1, send port 0:
  if (serial2.available()) {
  char in = serial2.read();
  serial.write(in);
  }
}

initially data being output garbled after leaving running hour data became 98% after 10 mins returned garbage.

i've connected gps mac , data flawless i'm beginning suspect max2323 device. have tried same setup on arduino due also.

can recommend rs232 ttl adapter known work? 1 have made lc technology inc

many thanks.

have connected ground of adaptor ground of arduino?

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