Visioneer Knowledgebase
Visioneer Knowledgebase
Title: Step 5 Parallel Scanners - Checking for Conflicts
Article ID: VIS1055
Updated: 12/22/2005
Operating Systems: Windows XP / 2000 / Me / 98
Scanner Models: StrobePro, PaperPort Strobe, 8650, 8600, 8100, 7600, 6400, X7600, 6100B, 6000, 5300, 3300, 3100A, 3100B, 3000, PaperPort OneTouch, PaperPort IX, VX, MX, 2400P, 1200P, 600P
You are getting "Scanner not found", "Unable to connect with scanner" or "Problem Communicating with the TWAIN Device" after installing the scanner driver and the PaperPort scanning software.
This is the fifth in a series of 6 steps. Additional links to other troubleshooting steps are at the end of this article. You may wish to print these instructions for your reference.

Parallel port scanners experience unique issues in port-sharing, contention, and driver conflicts.
Port Contention:

Port contention refers to the handling of the communication port within the operating system, and the ability of the operating system to communicate with multiple devices. Problems occur when sharing devices conflict, or when port request settings on the device do not match the port settings on the computer.
General Printer Troubleshooting:

Problems with either the scanner or the printer could be resolved by ensuring you are using the most recent printer driver. Check the Utility that came with the printer software: Turn off any option of: "Use port exclusively". Turn off the option to: "Use Bi-Directional Printing".
Port Mode:

What mode is the LPT port set to? The basic modes are SPP, EPP, and ECP, but your BIOS may reflect other choices.
  1. Open the Device Manager
  2. Click on the plus sign (+) to the left of "Ports (COM and LPT)" to view the mode that the parallel port (LPT) is currently set to.
  3. Try changing the PORT mode. If you are not familiar with the BIOS and changing port modes, we recommend that you contact your computer manufacturer or refer to the documentation that came with your computer. Technical Support will NOT be able to assist you in making changes in your BIOS, as there are too many different versions and Technical Support is not familiar with all of them.

A key item to notice is that Windows 98 will automatically set this option to "Auto" to enhance its Plug and Play capabilities.
Device Conflicts:

Two devices "sharing" a port can result in communication difficulties for either one of the devices or both devices causing them to not function properly. Some printers are not be able to share a port that they are connect to, as the continually "talk" to the port to see if they are receiving a print command.
  1. Uninstall the printer the scanner is sharing a port with
  2. Shut down thecomputer
  3. Remove the Parallel connection of the printer, and ensure the scanner parallel cable is directly attached to the computer.
  4. Boot the computer and re-test the scanner.
  5. If the scanner works without the printer, there is a conflict and a USB interface or additional parallel port on the workstation should be considered to isolate devices.
Epson Printers:

Epson printer attached to the pass-through on the scanner and either the scanner is not found, or the printer will not print could mean that the "Print Spooler Setup" needs to be modified. Creating a dedicated spool directory such as C:\SPOOL usually resolves this conflict. Complete instructions to resolve Epson Printer conflicts are available by clicking the VIS1093 - Scanner not Found when sharing Parallel Port with Epson Printer link below.
Canon Printers:

The Canon Bubblejet Status Monitor has been seen to conflict withscanner drivers, resulting in: Error Code 2, 5, 10, UI32.DLL, and "Scanner Not Found" issues. This monitor cannot be disabled. For resolution, the latest driver for the printer should be downloaded from Canon's web site.
Modem Drivers:

Occasionally an modem driver and older printer may experience conflicts. Use the Device Manager to disable any modems. If this resolves the issue, update accordingly.
If you still have conflicts, proceed with the step-by-step troubleshooting provided by the web links below:

VIS1051 - Step 1 Checking the Connections
VIS1052 - Step 2 Redetect the Scanner in Windows
VIS1053 - Step 3 Reinstall the Scanner Driver
VIS1054 - Step 4 USB Scanners - Checking Your Computer Chipset
VIS1055 - Step 5 Parallel Scanners - Checking for Conflicts
VIS1056 - Step 6 Contact Support


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Visioneer provides these technical articles for information use only. The information is generally for a specific scanner model distributed by Visioneer and a designated version of software provided with the scanner. Visioneer makes reasonable efforts to verify the accuracy of content and issue resolution in these technical articles but cannot guarantee any matter including accuracy or results. The articles are provided "as is", without representation or warranty, express or implied, whether of merchantability, fitness for particular purpose, title, or non-infringement. Visioneer disclaims any liability for damages, whether direct or indirect, special, incidental, or consequential, from use of the information in these articles. Visioneer does not evaluate any effect on software and hardware not provided by Visioneer, and therefore disclaims any liability for same. Visioneer is not responsible for the content of support pages accessed through external links. The articles are subject to revision or change without notice.