A technical description of the Chinese scale protocol and their operation.
The official User's Guide for OpenDRO. This serves as the User's Guide for both the DRO-550 and the DPU-550.
The official DRO-350 User's Guide for software release 4.
Bill Havins, a user of the ShumaTech DRO-350, wrote a great article on his experiences using Chinese scales. The artice covers where to purchase Chinese scales, their installation on equipment, and general troubleshooting.