Evaluation kit
If you want to bench-test before designing a module in, the evaluation kit on the main site is the quickest way to get a module, a cable and the documents together: erdilrf.com/evaluation-kit.
Before you order, read the evaluation checklist. It lists what to measure on the bench so that the first week of testing answers the questions that matter for your product.
For a model not listed in the kit, or for a question about the protocol of a model without a public document, write to tommy@erdimail.com.