DSD TECH SH-U12 RS485 to TTL 5V Board with MAX13487 Chip for Raspberry Pi Arduino and Other MCU

These TTL to RS485 converters work very well. Nice diagram on the bottom of the unit to let you know what's what as far as terminals.The board is large for it's function, but at least it has mounting holes to keep it steady.

So I did not see any reviews for this product but wanted to write something up. I needed to use a Raspberry Pi to connect to a BACnet network and I needed to read and write serial data. I really thought the Raspberry pi would work by itself but had issues with the connection I tapped into. I was reading at the wrong voltage and needed to step over. This device allowed me to connect on the serial tap and it works amazingly. Every script I wrote previously and have tried to debug to figure out why it was not working were now working. I may not be testing this to its limits but it was able to allow me to get the voltage to the appropriate level for me to read and write on the serial channel.

Might be OK for a point-to-point connection without line termination.Output is disabled (not active) whenever input is high.

This RS485 converter works as advertised. My application only required 9600 baud but operation was flawless with an Arduino Mega 2560. One thing I found was that, for my application, I needed to reverse the "A" and "B" RS485 signal lines. I don't know if this is an error on the board silk screen or my slave device label is in error. I am using the SH-U12 to talk to an ABB PID pump controller using Modbus protocol. If you can't get the converter to talk to your RS485 buss, try reversing the connection. This has worked so well, I am now using three of these!

Purchased to control an RS-485 based clock from a Raspberry Pi. Works perfectly. I especially like that jumper cables were included, making it a complete plug and play solution. Note that the TX pin on the microcontroller goes to the RX pin on the board.

I use this to communicate between an Arduino and a Click PLC using Modbus protocol, just what I needed.

Hooked it up and only A+ was working. B- output signal always low. Not fun.

The LED TX/RX indicators are reversed which makes absolutely no logical sense at all. When transmitting, the RX indicator lights up. When receiving, the TX indicator lights up. It's just so dumb.TX on the SH-U12 goes to RX on whatever you are connecting it to. RX on the SH-U12 goes to TX on whatever you are connecting it to. Some people commenting here seem surprised by this arrangement but it is normal Serial communication setup. After all, a TV station transmits to "A RECEIVER" in your TV. Right??A+ connects straight through to A+, B- connects straight through to B-, and GND connects straight through to GND between two SH-U12 units.The packaging is well done and thought out, but I can't find SH-U12 on their website and a little documentation would go a long way.