... source siemens positioner from our company,Website:http://www.wtindustrialeqpt.com, which is one of the best China siemens positioner manufacturers ... core cable, through the HART modem is connected to the COM port of a PC or laptop. HART communication signals are ... scaling, etc.• The fault signal can be output by wiring, can also be output by HAPT, field bus interface. In this case, with HAPT ...