The 8 Best USB To CAN Adapters

Editor's Notes

February 23, 2021:

To reiterate the previous editor’s note, these devices are used in a fairly specialized context, and there aren’t a whole lot of manufacturers on the market, so, by extension, there is a limited number of decent models. With that being said, I’ve left all of the models in from the previous update, as they’re all still decent, and I could find few others without issues that made me even want to consider including them on our list. I have however added the Grid Connect Pro FD, which supports the CAN FD or (CAN Flexible Data-Rate) protocol that builds on classical CAN. Although Grid Connect does have its own models, I do believe that they’re also a distributor or reseller of many of the adapters and other hardware components from Peak View, which is not necessarily a bad thing, because Peak View makes some of the best adapters and hardware interfaces for CAN.

Since CAN is a data bus, like USB, and not an actual hardware interface, it can use a variety of different connector types, which is why we’ve included options like the Drew Tech Mongoose Pro for OBD-2 ports, as well as the Utek UT-8251 ; many systems, however, will employ a 9-pin, d-subminiature connector, or a DE-9. Likewise, not all DE-9-to-USB adapters won’t meet the requirements needed to support or facilitate high-speed CAN connections. Quickly on the note of connectors, the DE-9 connector is often mislabeled and sold as a DB-9 connector, which is a mistake that stems from the fact that DB-25 connectors were replaced with DE-9 connectors on laptops, and most sellers simply carried the ‘B’ over without thinking twice about what it represented – which is the shell size, and should be represented with an ‘E’ in the case of the 9-pin d-sub. Unfortunately, the ‘B’ is still used, so don’t be confused.

June 07, 2019:

These devices are often used in a very specialized context and their descriptions involve a lot of jargon, so let's break down some of the main features so you can better understand which interface is best suited for you.

First let's talk data throughput speed. Data travels across CAN networks in packages called messages, of which frames are the most common. Some manufacturers use frames to measure the speed of their interfaces, such as the ViewTool VTG203B, which moves data at 8,000 frames per second. Others are measured using bits, like the Grid Connect GC-CAN-USB-ISO, rated at 1 megabit per second. A more technical term for this is the baud rate.

Messages can be different data sizes, depending on the CAN protocol. CAN2.0A and CAN2.0B are the most common, with 11-bit and 29-bit messages, respectively. Models like the Utek UT-8251 work with both, and this something that should be taken into careful consideration before making a purchase.