Open source LXI library
Clone or download
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Failed to load latest commit information.


Build Status

1. Introduction

liblxi is an open source software library which offers a simple API for communicating with LXI compatible instruments. The API allows applications to discover instruments on your network, send SCPI commands, and receive responses.

Currently the library supports VXI-11/TCP and RAW/TCP connections. Future work include adding support for the newer and more efficient HiSlip protocol which is used by next generation LXI instruments.

The library is based on the VXI-11 RPC protocol implementation which is part of the asynDriver EPICS module, which, at time of writing, is available from:

2. The liblxi API

The API is small and simple. It includes functions required for discovering and communicating SCPI messages with LXI devices:

    int lxi_init(void);
    int lxi_discover(struct lxi_info_t *info, int timeout, lxi_discover_t type);
    int lxi_connect(const char *address, int port, const char *name, int timeout, lxi_protocol_t protocol);
    int lxi_send(int device, const char *message, int length, int timeout);
    int lxi_receive(int device, char *message, int length, int timeout);
    int lxi_disconnect(int device);


Note: protocol is VXI11 or RAW

3. API usage

Here is a simple code example on how to use the liblxi API:

     #include <stdio.h>
     #include <string.h>
     #include <lxi.h>

     int main()
         char response[65536];
         int device, length, timeout = 1000;
         char *command = "*IDN?";

         // Initialize LXI library

         // Connect to LXI device
         device = lxi_connect("", 0, "inst0", timeout, VXI11);

         // Send SCPI command
         lxi_send(device, command, strlen(command), timeout);

         // Wait for response
         lxi_receive(device, response, sizeof(response), timeout);

         printf("%s\n", response);

         // Disconnect

The example above prints the ID string of the LXI instrument. For example, a Rigol DS1104Z oscilloscope would respond:

    RIGOL TECHNOLOGIES,DS1104Z,DS1ZA1234567890,00.04.03

See src/test for more examples.

4. Installation

The latest release can be downloaded from

4.1 Dependencies

Mandatory: libtirpc, rpcgen, libxml2

Optional: avahi

4.2 Installation using release tarball

Install steps:

    $ ./configure
    $ make
    $ make install

4.3 Installation using git source

First run the script which autogenerates the configure script:

    $ ./

Then follow the same steps described in 4.2.

4.4 Installation using package

liblxi comes prepackaged for various GNU/Linux distributions. Visit to see list of supported distributions.

5. Contributing

liblxi is open source. If you want to help out with the project please join in.

All contributions (bug reports, code, doc, ideas, etc.) are welcome.

Please use the github issue tracker and pull request features.

Also, if you find this free open source software useful please consider making a donation:


6. Website


7. License

liblxi includes code covered by the following licenses:

  • BSD-3, commonly known as the 3-clause (or "modified") BSD license
  • EPICS Open software license

For license details please see the COPYING file.

8. Authors

Created by Martin Lund <>

See the AUTHORS file for full list of authors.