Products > Test Equipment
Is the DE-5000 software useful?
JDubU:
The signal on the Rx input of your serial to USB converter board should look like the scope image below:
Note the readouts along the bottom left. The polarity of the signal is normally high.
Calambres:
I do not see such pulses in my scope. The ones I see are AC only pulses with a few millivolts.
Something's wrong with my UART and/or phototransistor |O
The UART board measures 4.23V in the 3.3V output so I suppose it is not working properly but I've read of many of these boards behaving this way.
Calambres:
PROBLEM SOLVED! 8)
As I didn't get any scope readings in the 3 or 4 volts magnitude as in your picture above (the pulses I got were in the millivolts range) I began to suspect the phototransistor was not working at all. In fact I ordered two L53P3C from this ebay seller (caveat emptor). None of them seem to work. I went to my local components store and bought a BPW77NB. As soon as I put it in the UART board I immediately noticed that, when attached to the DE-5000 in "PC" mode, the RX LED started flashing once every second. Now the scope reading is identical to that of JDubU's two posts up.
Now it works like a charm, providing I set up a 470R pullup resistor as JDubU stated some posts ago.
Thanks a lot to everyone helping! :-+
djeans:
you need to add a resistor, 470 - 1k, then it will work with the most of the phototransistors. Check it with your ocilloscope.
Connect OUT to your USB RS232's RX pin
Connect to 5 V / 3.3 V (depneding on your setting on the RSR232 USB converter)
Connect GND to GND
coromonadalix:
I would add the cp2102 sometime doesn't work well in recent os'es like win10, some prolific chipset too
I would use ch340 or ftdi based usb uart boards ...
but great work :-+
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