How to implement a copy of the COM port for listening?

I

Ilya Plotnikov2012-09-03 19:56:27

Iron

Ilya Plotnikov, 2012-09-03 19:56:27

I have a station that receives radio signals from devices and there is software that collects these signals. It is undesirable to interrupt the operation of the software.
I want to collect data transmitted via RS232 into a log. I tried software that allows you to sniff the COM port, but it seems to me that the sniffer reads data from the receiver software. You need to make a copy of the COM port to collect data, because. You cannot connect to the same port a second time. What software under win2k8 allows you to do that? I think that this is implemented like this: some software listens to the com port and creates 2 more virtual COMs, a program is connected to one, data is collected from the second.
Tell me what can be used? It is possible to take a system unit with 2 COM ports. Connect the device to one, connect the second to the server, and log to the system manager (if linux will be used, for example DEBIAN)

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5 answer(s)

V

Vladimir, 2012-09-03
@ilyaplot

you can use 2 com ports, or you can use a USB adapter USB2COM.

R

Roy, 2012-09-03
@Roy

For Windows, you can try this: www.eterlogic.com/Products.VSPE.html
Allows you to make a virtual COM port splitter. Free for x32.
For Linux, mix cat < /dev/ttyS0 > /dev/ttyS1 and tee to taste. Previously, it is probably better to set raw / disable echo for ports - via stty.

A

AR1ES, 2012-09-03
@AR1ES

Again, if for Windows, I would advise sourceforge.net/projects/com0com/ .
Open source, both 32 and 64 bit versions.
If desired, it will allow you to do even more: not only create virtual ports and redirect outputs to them, but also use the desired port from a remote machine if necessary.

I

Ilya Plotnikov, 2012-09-03
@ilyaplot

Maybe just connect 2 COM ports? All that is needed is data transfer from the transmitter to the computer.

T

teremock, 2012-09-04
@teremock

> I tried software that allows sniffing the COM port, but it seems to me that the sniffer reads data from the receiver software.
I don't quite understand what could be the problem.
For 10 years I have been using portmon just for such tasks. All that is needed - everything shows and all the data in both directions and the control lines and port parameters. Perhaps portmon will not just get up on 64bit Windows - the driver is not signed - but you can run everything on a 32bit virtual machine.