This isolated barrier is used for intrinsic safety applications. The device supplies 2-
wire SMART transmitters in a hazardous area. It transfers the analog input signal
to the safe area as an isolated current value. Digital signals may be superimposed
on the input signal in the hazardous or safe area and are transferred bi-
directionally. If the HART communication resistance in the loop is too low, the
internal resistance of 250 Ω between terminals 8 and 9 can be used. Test sockets
for the connection of HART communicators are integrated into the terminals of the
device.