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System software, User Manuals, and App Notes for free download

These distributions include the most recent and complete versions
The last table column contains the file size in bytes
Windows and Linux supported


To download from ...

    Microsoft Internet Explorer, right click and select Save Target As...
    Mozilla Firefox, right click and select Save Link As...


Tables of interest below are ...

    USBxCH 24 bit 4 or 8 channel A/D with GPS
    SER1CH-UA ultra low power RS232 serial A/D
    VREF-399 precision voltage reference
    Product Flyers
    User Manuals
    Papers and App Notes
    Component Specs

What's new as of ...

    2022/03/25 Better timing after GPS signal loss or daylight savings change
    2021/06/15 Better pipeline chain shutdown and improved reporting
    2019/11/30 Pak2Bin handles GPS not updated for the Week Number Roll Over
    2018/12/31 Improved USBxCH seismic examples - Earthworm/SeisComp/SEED/SWARM
    2016/08/25 USBxCH software now uses pipelines to connect utilities
     Fewer files, more flexibility, faster realtime response
    2013/12/20 8 channel USB8CH support, USBxCH uses generic WinUsb/LibUsb driver
    2010/10/05 Last USBxCH version with custom kernel drivers
    Legacy For legacy downloads for the PARxCH, PARGPS, DSP32C, etc ... click this link

Checksum info ...

MD5 and SHA256 checksums for the files listed on this download page are included in the file SrCheck.txt.
For information about the checksums and how to use them refer to the file SrCheckReadMe.txt.

The checksums of SrCheck.txt itself are:

    MD5 = 170b73be43faf7ccb72f3076fb98e8d0
    SHA256 = 351bdc2c173a04670eacaad00cc425bda70975b39d07ac622e2ffbaa99224b3d

System Software

USBxCH 24 bit A/D's with GPS Timing
Category Description Rev File # bytes
Product Flyer USB4CH specs 2012/01/15 flyusb4ch.pdf 152,815
Product Flyer USB8CH specs 2014/02/15 flyusb8ch.pdf 154,057
User Manual USBxCH 2015/12/01 manusbxch.pdf 1,589,352
System Software Windows 7/8/10 32+64 bit 2022/03/25 23,666,633
System Software Linux 64 bit ( Ubuntu 18.04 LTS, kernel 4.15.0 ) 2022/03/25 usbl64.tar 21,391,360
System Software ARM Linux BeagleBone Black Rev C ( Debian 7/8 ) 2022/03/25 usbbbb.tar 16,496,640
Note: The USBxCH system software supports both USB4CH and USB8CH including drivers, apps, and utilities.
Note: Linux software *MUST* match the bit size of your machine. Linux 32 bit available by request.
Note: Linux software also works on many other Ubuntu revs and distros such as Debian.
Note: BeagleBone Black single board computer software compiled on Linux 3.8.13-bone47 also works on 4.4.9-ti-r25.
Note: If you are upgrading from a pre-2011 version, please remove old custom kernel drivers first.

SER1CH-UA 24 bit low power A/D
Category Description Rev File # bytes
Product Flyer SER1CH-UA specs 2012/01/01 flyser1chua.pdf 151,643
User Manual SER1CH-UA 2008/06/13 manser1chua.pdf 1,019,195
System Software Windows XP/7 2016/12/20 4,591,094
System Software Linux 2.6.21-1.3194.fc7 (Fedora 7) 2008/12/15 serlnx.tar 1,464,320
Note: Utilities and software apps are included.

VREF-399 Test Instrument
Category Description Rev File # bytes
Product Flyer Precision voltage reference 2012/01/01 flyvref399.pdf 103,175
User Manual VREF-399 2010/01/15 manvref399.pdf 678,437
Note: No software is required for the VREF-399. It is a standalone system.


Product Flyers
Product Description Rev File # bytes
USB4CH A/D 24 bit, 4 channel, USB 2012/01/15 flyusb4ch.pdf 152,815
USB8CH A/D 24 bit, 8 channel, USB 2014/02/15 flyusb8ch.pdf 154,057
SER1CH-UA-1in A/D 24 bit, 1 chan, RS232 serial 2012/01/01 flyser1chua.pdf 151,643
VREF-399 VREF-399 precision voltage reference 2012/01/01 flyvref399.pdf 103,175

User Manuals
Product Description Rev File # bytes
USBxCH A/D, 24 bit, 4/8 chan, USB 2015/12/01 manusbxch.pdf 1,589,352
SER1CH-UA A/D, 24 bit, 1 chan, RS232 serial 2008/06/13 manser1chua.pdf 1,019,195
VREF-399 Precision voltage reference 2010/01/15 manvref399.pdf 678,437

Papers and App Notes
Category Description Rev File # bytes
Paper Scaling and Biasing Analog Signals 2007/11/24 scalebias.pdf 361,490
Paper - 3rd Party Using a Meinberg DCF Radio Clock w/ USBxCH 2014/01/22 radioclock.pdf 1,152,179
Paper - 3rd Party Analog Response of Sigma Delta Converters 2003/07/19 xferfunc.pdf 319,836
App Note Precision sine waves with the DSP32C 2001/06/28 appsine32c.pdf 86,365
Utility Generic FFT routines in C 1998/09/28 80,805

Component Specs
Product Description Rev File # bytes
USBxCH ADS1255 A/D converter by TI April 2005 ADS1255.pdf 432,155
USBxCH OPA2277 op-amp by TI April 2005 OPA2277.pdf 679,538
USBxCH GPS 16x HVS GPS receiver by Garmin B, Sep 2008 GPS16xHVS.pdf 605,692
SER1CH-UA LTC2400 A/D converter by Linear  Tech A, 1998 LTC2400.pdf 473,468
VREF-399 LM399 voltage reference by TI April 2005 LM399.pdf 668,543
VREF-399 LM399 voltage reference (additional specs) June 1976 LM399AN161.pdf 180,877
VREF-399 OPA2277 op-amp by TI April 2005 OPA2277.pdf 679,538
Note: The performance of our products often matches that of the underlying components. Copyright © Symmetric Research