Options for connecting to the datalogger while on-site. A serial cable (10873) is required for a direct connection between a computer and CR200-series, CR800, CR850, CR1000 and CR3000 dataloggers. For computers without a serial port, a USB to serial converter will also be required. A direct USB connection is available with the CR6, CR300-series and CR1000X dataloggers. This is included with your datalogger purchase or available seperately.