Communication; Process Alarm Override Switch - Vega FiberFlex LFXG-H Operating Instructions Manual

Installation
RS-485
The maximum cable length is 609 meters (2,000'). Use shielded wire per
local code.
Connect positive terminals together. Connect negative terminals together.
Connect ground terminals together.

Communication

The HART hand-held terminal can connect anywhere across the 4 ... 20 mA
wires to communicate with the gauge. A minimum requirement is a 250 
load-resistance on the current loop. A HART modem may connect across
the 4 ... 20 mA wires to enable communication between the gauge and a
PC.

Process alarm override switch

If the output relay is set as a process alarm relay (high- or low-level alarm),
you can install an override switch to manually deactivate the alarm. If you do
not, the process alarm relay de-energizes only when the measured level is
out of the alarm condition.
38
Example GEN2000 level gauge wiring
LFXG-H Installation and Operation Guide