I am new to using UART and I have a question about UART output and the RS232/RS422/RS485 serial decoder on the picoscope 2204A.
I'm trying to get a system working which sends data via a 550 USART (in asynchronous mode) from an LPC-Link2 development board to a computer, with the computer running PySerial.
I bought the picoscope to monitor the UART output to check it before I get it working with PySerial.
I am currently only using two wires, a GND and Tx, from my micro to the picoscope and having no luck getting the correct data using the RS232/422/485 serial decoder.
I have a feeling that the UART output I am sending is not compatible with the RS232/422/485 decoder. Should I be trying to send more signals such as a clock or something for the decoder to work properly? Or should I be trying a different decoder? Or trying to send an RSxxx signal from my micro (I think that's an option too).
Please ask for more info if you need it, I don't know what I am doing wrong, thanks.
Please find attached is my .psdata file.
Something I just noticed is that the serial decoder is trying to set itself to a much higher baud rate than what I initially set it to. I initially set it to 9.6k baud and let it run for a bit, but when I check it again and it has auto set to some custom baud rate in the Mbaud range.
Maybe I am sending signal at a far higher rate than I think? My initialisation settings are 9.6k but maybe something is going wrong with that.
- 20210831-0001-data for Pico forum.psdata
- (77.36 KiB) Downloaded 1193 times
I would suggest changing the timebase to 2ms/div or slower, and using a trigger at 1V and positioned at 20% so that you can capture a data packet clearly on the screen. You may need to adjust these settings for your particular setup and depending upon the actual data rate of the serial bus.
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