Emerson 308014EN Manuel D’Utilisation
7-3
Rosemount Tank Radar REX
Chapter 7 Bus Modems
Installation Manual
308014EN, Edition 4
May 2013
May 2013
7.1.2
Power Supply
Use adapter 90-264 V ac/9 V dc 1.5 A for RS232 communication.
DO NOT use external power supply when the modem is connected to
the USB port. The USB interface itself supports power to the FBM2180
modem.
the USB port. The USB interface itself supports power to the FBM2180
modem.
Figure 7-3.
Power supply for RS232
7.1.3
TRL/2 Bus
Use single twisted preferably shielded pair cable. Individual shielding is
mandatory if parallel buses run in the same cable. Polarity independent.
mandatory if parallel buses run in the same cable. Polarity independent.
Recommended wiring length:
Figure 7-4.
TRL/2 Bus terminal
Cable dimension
Maximum Length
AWG 20 (0.50 mm
2
)
3000 m
AWG 18 (0.75 mm
2
)
4000 m
Power supply (polarity independent)
(RS 232 communication only)
FBM2180_Back.eps
TRL/2 Bus
FBM2180_Back.eps