User Guides

COMTool User Guide

The COMTool is an easy to use serial communication terminal program that transmits and receives bytes to practically any device connected to a PC's COM port. The COMTool User Guide describes how to install the software and provides instructions on how to use the available features. COMTool User Guide.pdf, 848.18 KB, 12/03/2013   Read More »


USB4 - Connecting Multiple Devices Q&A

Question: When I plug in a second USB4 device, Windows gives me an error: Widows cannot load the device driver for this hardware because a previous instance of the device driver is still in memory. (code 38) I can reboot and still one of the devices does not enumerate. Answer: The Cypress driver used by the USB4 device is capable of supporting multiple devices.  After the first device is... Read More »


QSB Manual Firmware Update Procedure

This document provides step by step instructions on how to manually update a QSB device's firmware. QSB Manual Firmware Update.pdf, 284.98 KB, 02/07/2013   Read More »


T7 Modbus Communication User Guide

This document describes the host serial port communication protocol of the T7-1-MOD2/T7-1-MOD4. Download the T7_Modbus_Communication_User_Guide.pdf, 192k, v1.3, 1/9/12   Read More »


USB4 Driver Upgrade Instructions

Uninstall the old version of the USB4 drivers before installing the latest version. Perform the following steps to make sure all USB4 device entries have been uninstalled before installing the lastest version.  To remove old USB4 drivers from Windows Vista and Windows 7. 1. Go to Control Panel and double click on System. You can also right-click "Computer" on the Start menu (or on... Read More »


QSB Command List

This document describes the communication format for the QSB product.  It also lists and describes the commands available for the QSB device. QSB Commands List.pdf  (451KB)   Read More »


SEI Serial Encoder Interface Bus

SEI Data Sheet US Digital's SEI bus is a simple, quick and convenient way of networking devices to an RS232 serial port. The AD2-B adapter is available to interface to a standard RS232 port (9-pin DSUB) such as those in PCs. A wall-mount power supply furnishes the power for all devices on the SEI bus. SEI Network Absolute Maximum Ratings Parameter Min. Max. Units Operating... Read More »


SEI Absolute Encoder Communications Protocol

SEI Absolute Encoder Communications Protocol Data Sheet Each encoder on the bus is assigned a unique address between 0 and E. The host computer is the master of the bus, while the encoders are slaves. Encoders cannot initiate communication, rather the host sends commands and the encoders respond. The first byte of a command always includes the address of the encoder to be selected. Address F is... Read More »


QSB Application Examples

This document shows some examples of the comands necessary to activate some of the basic features available on the QSB product. QSB Applications Examples.pdf (354 KB, Version 1.5)   Read More »


T7 DLL User Guide

This document describes how to install and use the T7 DLL on a PC running Windows using the RS232 port or the US Digital USB-232 USB interface. T7 DLL User Guide.pdf (529KB, 10/01/09)  Read More »


T7 Communication User Guide

This document describes the host serial port communication protocol of the T7-1-232/T7-1-485/CANA-232/CANA-485 adapters.T7 Communication User Guide.pdf (8/11/2011, v1.6, 256 KB) Read More »


USB4 User Manual

This is the User Manual version 1.5 for the USB4-S / USB4-D.  USB4 Manual_v1-5.pdf (773 KB)   Read More »