SparkFun RS232 Shifter connection diagram

Development Boards Arduino
1

Hi!

My DC motor controller has a communication output via a serial RS232 port. With the help of the Arduino, I could read information about the battery status, setting different limiters, etc …

I bought the required RS232 shifter for this, as I need to bring the communication to the TTL level for the Arduino.

Since I have no experience in this, I need little help.

Before I connect everything without causing a short circuit or burning of some electronics, I need your advise: is this the proper way to connect the RS232 shifter between the controller and the arduino mini pro board?

Thx!

RS232 level shifter.jpg
RS232 level shifter.jpg1410×816 82.9 KB

2

It looks like you have your RX and TX pins backwards on both sides of the RS232 shifter.

Your controllers TX pin needs to connect to the RX pin (pin 2 on the DB9)

and the your controllers RX pin needs to connect to the shifters TX pin. (pin 3 on the DB9)

On the other side of the shifter, The Arduino TX pin needs to connect to the shifters RX

and the Arduino’s RX pin connects to the shifters TX.

3

Thx!

As for the power supply of the board, is the connection good? Power from the Arduino and not from the controller? GND connected on both sides?

Thx one more.!

4

You’re power looks OK. :slight_smile:

5

Thank you so much!