Description: The smallest and easiest to use serial conversion circuit on the market! This board has one purpose in life - to convert RS232 to TTL and vice versa (TX and RX). This will allow a microcontroller to communicate with a computer. Shifter SMD is powered from the target application and can run at any voltage! That’s right - power the board at 5V and the unit will convert RS232 to 5V TTL. Power the board at 2.8V and the Shifter board will convert RS232 to 2.8V CMOS TTL. Includes two indicator LEDs for TX and RX. Runs from 300bps up to 115200bps.
This version comes with no DB9 connector attached. Useful for field installations and projects where RS232 serial is coming from something other than a DB9 cable.
Based on 4 ratings:
1 of 1 found this helpful:
I could receive using this board (after realizing I needed a null modem), but couldn’t send signals properly. I ended up getting a MAX232 which is working perfectly – should have gone that route all along for my project.
I was powering this with VCC=5v and wondering why the TX-O wasn’t producing a signal on the RS232 side.. while my MCU can accept 5V signals, it only produces 3.3v logic level outputs.
Switched the VCC to 3v3 and everything is working perfectly!
I have this device installed in a Motorola Micom Mobat 2ET radio, along with the Bluetooth Mate Silver WRL-12576, and the wireless serial connection is fantastic. Bidirectional data transfer is fully functional.
What may not be clear to someone who cannot read a schematic, and understand the circuit, is that the TX-0 on this board connects to the RXD on the serial device while the RX-1 on this board connects to the TXD on the serial device. When properly connected, this functions perfectly.