DSD TECHSH-U09C USB to TTL Serial Adapter with FTDI FT232RL Chip Compatible with Windows 11, 10, 7 and Mac OS

I needed this to program a Nextron LCD display via a USB port. At first, my Nextron screen showed only lines and static. Then I realized the power jumper was set to 3 volts, and the Nextron required 5 volts. After that, no problems. It just works.

This is a well designed unit at a remarkable low price for what it does. The material quality is top rate. Very convenient item for interfacing a USB port to a serial port. I simply plug it into a USB port on my laptop and use the provided cable to connect the interface unit to the serial interface pins of my microcontroller board. The use of clear plastic to encase the unit is very smart. It allows you to view the LEDs monitoring the Rx and Tx lines to ensure data is transferring properly. Makes programming the microprocessor easy, using the software on my Windows 10 computer. Installing the Win 10 driver was also easy by downloading it from the FTDI website. It also provides the use of 3.3 volt or 5 volt logic by use of a simple jumper on the unit. They also provide a jumper for loop back testing. Highly recommend it.

I bought this adapter to interface a uBlox Neo-8M GPS module to use as a time reference with PPS to create a stratum 1 NTP server on Windows 10. It powers the GPS with no problem. I soldered a lead to the CD (carrier detect) hole on the PCB and connected it to the PPS output of the GPS module. It works, but be careful. It appears that the RS-232 control signals (CD, CTS, RTS, DTR, DSR, etc) are inverted. So my PPS driver was triggering on the falling edge of the CD signal instead of the leading edge. I was able to compensate for this by using an offset.

Update: The boards work perfectly in every way, except with the Reyax RLYR998 LoRa boards. On Windows, Linux, Raspberry Pi, or Android, they just will not work with the LoRa board. I have returned the boards and changed my rating from 5 to 4.I had no installation problems at all. The boards are seen as "com12" on Windows and "/dev/ttyUSB0" on Linux and Raspberry Pi. I found that the "cutecom" program is available on all three platforms, which gives me a good way to use them for initial testing or to interface to Reyax LoRa radios. Using various online examples, I was able to make a little Raspberry Pi Python program use the boards.Other terminal programs that worked for me are:"Serial USB Terminal" on an Android phone,PuTTY,HTerm, gtkterm, screen, cu and Picocom on Linux,PuTTY and Terminal.exe on Windows.However, I came to learn that that the Raspberry Pi has its own "UART" built into the GPIO pins. If you want to control a Reyax LoRa Radio from the Pi, you don't need these DSD Tech boards at all. Just hook up to the proper GPIO pins, enable serial I/O in raspi-config, and specify /dev/ttyAMA0 instead of /dev/ttyAMA0. From a Python program, the GPIO pins and the DSD Tech board are used in exactly the same way.

I can't tell you how many of these I have bought through the years. I'm just glad they are consistently available.If you need a TTL to USB interface using a genuine FTDI chip, this is an excellent choice.BT Recommended

Absolutely consistent results with this board. I really like the 3.3v / 5v selection jumper, too.

As expected

I like the switchable voltage levels, either 5v or 3.3. this unit is well made and works with windows without any problems. I purchased this unit after having some problems with other off brand adaptors. happy with the DSD tech brand quality.