Emerson Rosemount 5408 Quick Start Manual page 17

February 2020
Figure 8-2: Cable Shield
C
A. Insulate shield and drain wire
B. Minimize distance
C. Connect drain wire to a good earth ground
Note
Do not ground the shield and its drain wire at the transmitter. If the cable
shield touches the transmitter housing, it can create ground loops and
interfere with communications.
Common signal reference ground for RS-485
Best practice is to connect a third reference wire to the "COM" terminal
(common signal reference ground).
If a common reference wire is not used, then the "COM" terminal should be
connected to the "–" power terminal. The common mode difference
between the host RS-485 and the negative power supply must be between
-7 V and +12 V.
8.4 Power supply
The transmitter operates on 9-36 Vdc at the transmitter terminals.
Quick Start Guide
B
Quick Start Guide
C
17