603H Loop Calibrator is a time-saving solution and generate high-quality results. It comes with HART communication function and supports one selected group of HART general instructions and general application instructions. 603H has a built-in universal HART modem to execute the following commands: read information; read tags, descriptors and calibration date; read sensor PV information; read PV output information; read long tags; write PV range (upper and lower limit); write the main variable unit, short address and short label; enter/exit the fixed current mode; adjust the zero point offset; fine-tune the DAC zero point (mA output: 4mA) ; fine-tune the DAC gain (mA output: 20mA)