SMAR DT302, Owner'S Operation And Maintenance Manual

Page: 33 / 84

Operation
2.3
Fieldbus Modem
Monitors line activity, modulate and demodulate communication signals, inserts and deletes start
and end delimiters, and checks integrity of frame received.
Power Supply
Takes power of the loop-line to power the transmitter circuitry.
Power Isolation
Isolates the signals to and from the input section, the power to the input section must be isolated.
Display Controller
Receives data from the CPU identifying which segments on the liquid crystal display to turn on. The
controller drives the backplane and the segment control signals.
Local Adjustment
There are two switches that are magnetically activated. They can be activated by the magnetic tool
without mechanical or electrical contact.
Figure 2.3 - LCD Indicator