The CR510, CR500, CR10X, CR23X, CR800, CR850, CR3000, and CR1000 can be used for Modbus applications.
The CR510, CR500, and CR10X require a special operating system. Purchase an operating system with the Modbus protocol, and download it to the datalogger using CSOS downloading software or the DevConfig Utility.
Modbus protocol is standard in the CR23X, CR800, CR850, CR3000, and CR1000.