While cleaning up my desk, I found the software CD of the UT61E and it reminded my of the lacking USB connection for my DMM. So I checked to see if this could be upgraded to USB.
Sure enough I found this article and it looked simple enough to make the conversion myself.
Well, after tinkering around and trying to implement the same schematic, I couldn't make it work.
Not with a CH340 nor with 2 other models of PL2303 USB-serial converters. No matter what I did, the serial monitor would produce only garbage.
So, I decided to give it another go and go back to basics. I checked around what I had lying around in my stock and found a couple of DIL and SMD packages of 74HC02 and 74HC04.
|Schematic using logic gates|
Next step was to depopulate the original pcb inside of the IR-receivr. I only kept the IR-diode.
I kept 3 of the 5 wires. Brown = GND, White = VCC, Yellow = RX (actually TX, but it connects on the RX pin of the USB-serial converter).
After careful mounting and sealing of the IR-receiver, I was able to slide it back into place. As you can see, the setup with logic gates only takes minimal space inside the enclosure.
Because the UNI-T UT61E software only recognizes comports 1-4, I installed my CH340 USB-Serial converter on COM3. It works like a charm