Read and send HEX sting by serial

Using Arduino Programming Questions
8

Sorry that I didn't understand it with the first post.

I think it has to do with the Carriage Return (CR, '\r', 0x0D) and/or Line Feed (LF, '\n', 0x0A).
If you connect the weigher to the PC, you probably send the code with CR and/or LF.
You could read the specification of the weigher, but I would start to send them both.

Mx3232Serial.write(0x01);
Mx3232Serial.write(0x73);
Mx3232Serial.write("\r\n");

or this

Mx3232Serial.write(0x01);
Mx3232Serial.write(0x73);
Mx3232Serial.println("");       // send CR LF

or even this

Mx3232Serial.println("\x01\x73");   // send 0x01, 0x73 with CR LF