Delta's AC motor drive is designed with communication ports for RS485 connection and it supports the MODBUS protocol for data transmission and exchanges. Users can read/write data from Delta’s AC motor drive using a computer simply by installing any kind of MODBUS software to the PC. For a program writer, Delta provides MODBUS DLL file to facilitate the programming process. Please download the “Delta Modbus DLL Library” from Delta website: http://www.delta.com.tw/product/em/download/download_main.asp?act=3&pid=3&cid=1&tpid=3. The DLL file allows users to modify the parameters and also to monitor and control the AC motor drive. Ex: Communication setting for an AC motor drive (default: station 1, ASCII mode) and commands are given as following via MODBUS: “:010620000002D7\x0D\x0A”  AC motor drive begins operation “:010620000001D7\x0D\x0A”  AC motor drive stops operation The code represents: 01= station number 06= function code (write in) 2000H = AC motor drive’s register For more detail, please refer to any AC motor drive series’ user manual.