So I buy 5 of these little things when I find out I am dealing with RS232 device instead of a TTL device. They arrive quick and I am delighted only to find I dont quite know how to wire them up. The project is to use an Arduino – which I love dearly – to drive an LED rolling display. I am not an electronics expert – so I struggled a little and popped 2 of them good and proper. I’ll buy this instead I am as always standing on the shoulders of giants – So my experience is: From the RS232 Port – RX, TX and GND.

Thats the ->- RX – PIN X. Hi, Thanks for you post, very helpful!

Dynamic Dns Update Clients here. I’m trying to connect rs232 enabled barcode scanner, to Arduino Uno, (I know I can connect it with USB host shield, but I prefer the simple rs232 connection.) I bought the PCB with the max3232 chip, connected the TX Rx gnd and vcc of Arduino to the TTL side, and the serial barcode TX Rx, (gnd to minus, vcc to plus) to the rs232 side. I tried to read the serial in the Arduino code, but received nothing I must add that I connected also more power to the barcode scanner, and the device turned on, so it seems that I missed some initialization code to the RS232 protocol, or something, can you tell what do I need to start to do in the arduino code? Thanks Moshe.

Jun 02, 2013 22 thoughts on “ Serial Port Mini RS232 to TTL Converter Adaptor Module Board MAX3232 with Arduino ”. Just US$4.39 + free shipping, buy WaveShare RS232 Serial Port to TTL Converter Communication Module online shopping at GearBest.com.