Emerson 308014EN Manual do Utilizador descarregar pdf (Página 43)

6-3

Rosemount Tank Radar REX

Chapter 6 The Field Communication

Installation Manual

308014EN, Edition 4

May 2013

6.2.2 RS 485 communication

Each FCM interface board can be replaced with FCI interface boards for

RS-485 communication.

Note! The wire terminals 1 and 3 respectively 2 and 4 on FCM board connector

are parallel connected. See installation drawing.

6.3 Write Inhibit/Enable Switch

There is a write inhibit switch in the FCU that can be used to prevent

unauthorized changes in the FCU database. It can be locked in the write

inhibit position by securing a locking plate with a wire through the clevis

pins.

Figure 6-3. Write inhibit/enable switch.

230 V

115 V

Reset switch

Write inhibit

Write

enable

FCU_WriteEnableInhibit.eps

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Emerson 308014EN Manual do Utilizador Página 43