4-67
Rosemount Tank Radar Rex
Chapter 4 Service
Service Manual
308012En, Ed.2
May 2013
4.4
FBM
The Field Bus Modem acts as a converter between USB or RS-232C
and the TRL/2 Bus. The TRL/2 protocol is used for communication with
Rosemount Tank Gauging equipment.
The Field Bus Modem may also be used to connect foreign units to the
Field Bus.
Connecting a PC with the TankMaster software to the TRL/2 bus
requires a Field Bus Modem model 2180.
4.4.1
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.
4.4.2
Operation - front panel
The FBM 2180 front LEDs show information on power supply,
communication status and communication interface.
The Termination switch is used if there are extremely short cables
between the transmitter and the modem.
The Gain switch is set to Lo by default. This setting is sufficient in most
cases. The Hi Gain setting may be used if cable dimensions are
insufficient resulting in a heavily damped communication signal.
Figure 4-33. The Field Bus Modem
External power
LEDs for external power
and communication
Gain switch
Termination switch
RS232
USB
Receive
Transmit
Содержание TankRadar Rex DAU 2100
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