# Serial port source/sink **URL:** \ **Category:** GNU Radio\ **Created:** [October 28, 2014, 7:36pm UTC](https://www.ruby-forum.com/t/serial-port-source-sink/232797 "2014-10-28T19:36:32Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Post date:** [October 28, 2014, 7:36pm UTC](https://www.ruby-forum.com/t/serial-port-source-sink/232797/1 "2014-10-28T19:36:32Z")
Hey there! i’m working on a proyect of comunications and i need to get my serial data stream into gnuradio companion, so i’m looking for a block (2 actually) that can make this work, i tried to install pyserial and gr-pyserial but repository is down, so i’m looking for alternatives, that make me skip programming it myself (becoues of my low programing skills ), so i though serial port is pretty comun, some one else had to build it before, if you know some blocks which could help me i would be very thankfull ---
**Author:** ![JuliSSn\_AndrSSs\_Que](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/839c29/32.png) [@JuliSSn\_AndrSSs\_Que](https://www.ruby-forum.com/u/JuliSSn_AndrSSs_Que)\ **Post date:** [October 28, 2014, 7:42pm UTC](https://www.ruby-forum.com/t/serial-port-source-sink/232797/2 "2014-10-28T19:42:30Z")
I can look into my repos. Those blocks were meant for a customer who specifically had to interact with a GR app through serial, due to legacy interfaces/software. This allow them the interface to a GNU Radio app through virtual serial connections (ie. SOCAT), just as if they were connected to an 90’s vintage radio. Is there a specific reason you want to do this through serial? Can you explain your architecture? -John On Tue, Oct 28, 2014 at 11:35 AM, Julián Andrés Quenardelle \< ---
**Author:** ![JuliSSn\_AndrSSs\_Que](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/839c29/32.png) [@JuliSSn\_AndrSSs\_Que](https://www.ruby-forum.com/u/JuliSSn_AndrSSs_Que)\ **Post date:** [October 28, 2014, 7:44pm UTC](https://www.ruby-forum.com/t/serial-port-source-sink/232797/3 "2014-10-28T19:44:17Z")
Also, I just checked. The repo works fine through https but not ssh… :shrugs: On Tue, Oct 28, 2014 at 11:41 AM, John M. \< ---
**Author:** ![JuliSSn\_AndrSSs\_Que](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/839c29/32.png) [@JuliSSn\_AndrSSs\_Que](https://www.ruby-forum.com/u/JuliSSn_AndrSSs_Que)\ **Post date:** [October 28, 2014, 11:35pm UTC](https://www.ruby-forum.com/t/serial-port-source-sink/232797/4 "2014-10-28T23:35:57Z")
Hi Julian, this really depends on how your serial data gets into your PC, but assuming you’re on linux and have the data coming in over a properly configured character device (ie. something that appears as /dev/ttyS\* or the like), you could just use the file source and open that device. Greetings, Marcus ---
**Author:** ![JuliSSn\_AndrSSs\_Que](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/839c29/32.png) [@JuliSSn\_AndrSSs\_Que](https://www.ruby-forum.com/u/JuliSSn_AndrSSs_Que)\ **Post date:** [October 29, 2014, 12:58am UTC](https://www.ruby-forum.com/t/serial-port-source-sink/232797/5 "2014-10-29T00:58:50Z")
Agreed, but as soon as device setup is through with your device (thus the “properly configured character device”) and your reading program behaves nicely (which I’d expect GR’s file\_sink to do), just reading from a character device should work, if I’m not mistaken. However, this brings us to a new question: “serial” doesn’t really say what kind of interface we’re talking about; there’s a whole lot of bytes that you can not send over a 1980’s style UART as used for the RS-232 peripheral on PCs, and thus the data that comes in over that has to be decoded first; you could write a block that converts these bytes to bytes, or, and this is more likely, you already have software that does that, and writes the result to a file, or prints it on standard output. You could then connect the output of that to GNU Radio, e.g. using a named pipe. ---
**Author:** ![JuliSSn\_AndrSSs\_Que](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/839c29/32.png) [@JuliSSn\_AndrSSs\_Que](https://www.ruby-forum.com/u/JuliSSn_AndrSSs_Que)\ **Post date:** [October 29, 2014, 12:23am UTC](https://www.ruby-forum.com/t/serial-port-source-sink/232797/6 "2014-10-29T00:23:04Z")
On 10/28/2014 06:34 PM, Marcus M. wrote: > Hi Julian, > this really depends on how your serial data gets into your PC, but > assuming you’re on linux and have the data coming in over a properly > configured character device (ie. something that appears as /dev/ttyS\* > or the like), you could just use the file source and open that device. > > Greetings, > Marcus > TTY I/O on Unix is a bit weird. You’d have to open it, and configure it > (into RAW mode for one). ---
**Author:** ![JuliSSn\_AndrSSs\_Que](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/839c29/32.png) [@JuliSSn\_AndrSSs\_Que](https://www.ruby-forum.com/u/JuliSSn_AndrSSs_Que)\ **Post date:** [October 29, 2014, 3:44pm UTC](https://www.ruby-forum.com/t/serial-port-source-sink/232797/7 "2014-10-29T15:44:56Z")
Hey there! I’m gonna explain a bit of what i’m doing. I’m trying to conect a laptop with a ground control station software to an uavdevboard (UDB4). I want to get data stream through gnuradio, i want to make it serial because of previous work. I can set up the baudrate of transmision at my software (running on windows bdw) and my devboard too, i don’t know if that would affect the TTY I/O on Unix (that was a good idea btw, gonna work over that). However, my inteface is an USB/Serial cable if thats what you’re asking, i didnt use the RS232 standard, just needed TxRx pins from the devboard. 2014-10-28 20:57 GMT-03:00 Marcus Müller [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): ---
**Author:** ![JuliSSn\_AndrSSs\_Que](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/839c29/32.png) [@JuliSSn\_AndrSSs\_Que](https://www.ruby-forum.com/u/JuliSSn_AndrSSs_Que)\ **Post date:** [November 4, 2014, 12:16pm UTC](https://www.ruby-forum.com/t/serial-port-source-sink/232797/8 "2014-11-04T12:16:14Z")
Hey there, i succeed (think i do) installing gr\_pyserial block, i wanted to test it making a loopback but when i compile muy gnuradio block i get this Generating: “/home/iua/Documentos/ComSerialGnu/top\_block.py” > > > Warning: This flow graph may not have flow control: no audio or usrp > > > blocks found. Add a Misc-\>Throttle block to your flow graph to avoid CPU > > > congestion. Executing: “/home/iua/Documentos/ComSerialGnu/top\_block.py” linux; GNU C++ version 4.6.3; Boost\_104601; UHD\_003.004.003-175-g09de3c07 Traceback (most recent call last): File “/home/iua/Documentos/ComSerialGnu/top\_block.py”, line 48, in tb = top\_block() File “/home/iua/Documentos/ComSerialGnu/top\_block.py”, line 32, in **init** self.serial\_port\_0 = grpyserial.serial\_port(“/dev/ttyS0”,0,9600,0,1,False) File “/usr/local/lib/python2.7/dist-packages/grpyserial/serial\_port.py”, line 62, in **init** num\_msg\_outputs = 1, TypeError: **init** () got an unexpected keyword argument ‘num\_msg\_inputs’ and i have no idea what this means or what’s happened i’m totally lost, so i beg you help me with this fellas, thanks a lot for your time. ---
**Author:** ![JuliSSn\_AndrSSs\_Que](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/839c29/32.png) [@JuliSSn\_AndrSSs\_Que](https://www.ruby-forum.com/u/JuliSSn_AndrSSs_Que)\ **Post date:** [October 30, 2014, 11:25am UTC](https://www.ruby-forum.com/t/serial-port-source-sink/232797/9 "2014-10-30T11:25:08Z")
Hi Juli?n, interesting! I think I might be misunderstanding what’s happening here, so I think we should make a sketch of what I think you’re doing: “data” --\> Ground control station --\> TX Antenna --\> Air --\> RX Antenna UAVdevboard Is that correct? Greetings, Marcus