Have been using Brainboxes ED-538 in our automated weighbridge stations for capturing sensor states and controlling traffic lights for a few years with great success. Units are reliable and easy to integrate into our software applications.
The products are sturdy, we're excited to be using them
TJ Solutions, LDA
Great product at great price
Igloo Controls Ltd
Website is great, lots of detail about the products which is great considering the nature of them!
Cape Software, Inc.
I like the small form factor of the USB RS-485 products.