Satron USB-HART modem for smart transmitter configuration. SI-Tool is a USB-HART modem for 4…20 mA 2W/3W-transmitters. Downloads driver-FTDI21214.zip (1.98 MB) driver-FTDI20814.zip (1.16 MB) SI-TOOL-E-engl-fin.pdf (303.93 KB) Do you have questions? Please take a look at our Q&A, service process or contact information Find out your closest distributor!