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RS-232 test on Ardbox HF Family


In this post it is showed how to test the RS-232 on Ardbox HF family versions.


20 IOs PLC:          Ardbox Family Products

RS-232 Library:             Industrial Shields RS-232 Library (Github)



Connecting an Ardbox with other equipment through RS-232.

On the Sketch is showed that you must send a 25 thought RS-232 to complete this test.

RS-232 Test sketch:

 #include <RS232.h>

void setup() {
  Serial.println("rs232-echo-simple started");


void loop() {
 if (RS232.available()) {
    byte rx =;


See also

 Ardbox Relay RS-232 Help Page 

Ardbox Analog RS-232 Help Page

RS-232 test on M-Duino plus

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