Tech Support

Advice to technicians and users.

VMSpc Downloads

New version v4.0.9b [To be renamed v4.1] is ON HOLD pending a patch. Seems we broke the Odometer. v4.1 Official will be available shortly.
This release includes the J1708 bug fixes (for missing data) and gives an option for Round ("Radial") gauges. Other notes are may be found in the Forum topic "4.0.9 Feedback"

This can be used on any coach/ chassis with J1708 (6-pin or 12-pin), J1939 9-pin type-I 250kb (black) or type-II (green) 500kb diags interface.

Check the Forum for any new bug fixes and changes.

The new 4.x software mixes the original layout style with a new feature set. Once you try this new version out, you'll never want to go back to anything older!

Even if you don't have the VMSpc Cables and Hardware you can still install and try out the software. You can see for yourself how easy it is to customize VMSpc to your tastes. And when you are ready to "go live", give us a call at (888) 741-0259 and we'll set you up with everything else you need.

Software upgrades are always free and no log-in is required. When in doubt: Read the manual.


As diagnostic ports vary greatly across the spread of coach-builds and years, the pinning and socket types vary significantly. When you call we will ask for your coachs' make, model and yer as well as what type of Diagnostic socket(s) you have. This may require a close look, first, to determine the physical nature of the socket, number of pins available and those used in that socket. Refer to the Connector Document to identify what the Diagnostic sockets look like. Its regretful that, for this reason alone, we're not able to have an online store.

To start a fresh installation, download the latest "Distribution Disk," below. However, when first prompted, Open it (don't download it) --save/copy the Folder it contains to a place on your PC you can find easily, such as c:\ or your Desktop.

Install the drivers by Opening 'Install_Drivers.exe' Once the driver Software has completed, Install program from that same folder (ex: "Distribution_Disk_v4.0.x"). Reboot, open the VMSpc program with that new desktop shortcut, select your specific engine (when prompted). The first time opening you'll need to confirm that communications are set; USB JIB etc. Follow the manual on this--not too difficult. Need a hand? Call and we can walk you through.

If you are having difficulty Installing VMSpc v4.x, please refer to our All Versions Frequently Asked Questions Page for further information.

Be sure to give a call if you get stuck or need clarification.

Need an engine calibration file not on the list? Look here: Engine Calibration Files New engines are added on an as-needed basis for the most part...

Older program versions (prior to v2.5) and drivers have been archived; contact us by phone or Tech Support (below) for help.

VMSpc Downloads

VMSpc Additional Engines

These are the complete set of Engine Files available to date. New ones can be added, just make the request either by a forum posting or a phone call.

New versions of VMSpc include these Engines in the VMSpc Install Program.

VMSpc Engine Files

Looking for a particular engine for your VMSpc™ installation? All the current engine files that we have added to the VMSpc distribution since 2008 are here for your convenience - Open the link for the group, extract the Engines Folder to your C:\VMSpc folder, then select [Advanced] [Engine Type] use the [Look In] box at the top to open the newly downloaded Engines folder. Select your engine then click [Open]. you're done ;-)

If your engine is not included in the VMSpc Installation or on this page, contact us and we'll go to work on developing the calibration tables for it. Some ISL9 engines have been difficult (or impossible) to find data on. It seems Cummins is choosing to keep this information "proprietary" and otherwise all to themselves. If this is the case, you may need to help by requesting it or scouring the web for it.

Also note that these files are only used to calculate torque and horsepower. All other gauges and features will function and report without them.

USB to Serial Drivers

SilverLeaf has resold two different brands of USB to Serial adapters.
Both the Bafo BF-810 and the Sabrent SBT-USC1M use the Prolific PL-2303 USB to Serial Bridge Controller to convert Standard RS-232 to USB for Laptops that don't have built in RS-232 Serial ports.


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