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serial connection problem

Started by michielvd, May 11 2011 12:48 PM

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4 replies to this topic

#1 michielvd

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Posted 11 May 2011 - 12:48 PM

I know there are already many topics on this subject but none of them could help me so far. I'm using a netduino and a usb to serial device(this normally works fine) I am able to use it with other devices so.) I connected the ground to the ground of the netduino the send to the receive and the other way around. When I send an 'a' with a terminal like putty or any other program I receive an 'O' on my netduino (printed by debug). even when I send raw bytes with a program I wrote myself this is received wrong. the other way around is the same problem when I send with the netduino I receive something different on my computer. Is this a problem in the firmware or something? or something with the char-set? Anybody any Ideas?

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#2 Chris Walker

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Posted 12 May 2011 - 09:23 AM

Hi michielvd, I'm guessing that it's a baud rate or parity/stopbits/flowcontrol setting issue. Have you tried using 115200,N,8,1 (with "no flow control") on each side? We use that frequently in projects. What settings are you using on each side? Also, are you using a USB-RS232 adapter on your PC...and if so, which make/model? BTW, it's worth noting that the serial communication on COM2 is tested in depth during the automated testing of every Netduino. At 115200,N,8,1. Chris

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#3 michielvd

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Posted 12 May 2011 - 11:50 AM

Have you tried using 115200,N,8,1 (with "no flow control") on each side? We use that frequently in projects.

What settings are you using on each side? Also, are you using a USB-RS232 adapter on your PC...and if so, which make/model?

at first I was using 96000,N,8,1 and COM1 when switching to the settings you gave the exact same problem showed up.
I'm using a prolific PL-2303.

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#4 michielvd

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Posted 29 May 2011 - 09:11 AM

The problem is was that the converter didn't use the right voltages. I ordered an other one and the communications worked just fine.

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#5 edgar3232

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Posted 27 January 2013 - 02:02 AM

could you help me i have a problem, im using a [color=rgb(102,102,102);font-family:'Trebuchet MS', Trebuchet, Verdana, Helvetica, Arial, sans-serif;font-size:12px;]PL2303 to convert usb to serial, im conecting this to my netduino but nothing happens. i tryed to send a bite but it doesnt retunr to my pc[/color]