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User's Guide
308010EN, Edition 2
July 2007
3.
Troubleshooting
3.1
The RDU40 flashes a checkered pattern.
Check the following:
Bit 0 in holding register 69 set to 1 to enable display control.
The part number of the FCC card must be 9150072673b, 9150072675a
or later, otherwise the jumpers on the FCC card have to be moved to
position 1, according to picture 10. The part number is printed on a stick-
on label on the FCC card.
Figure 3-1.Jumpers on FCC card.
REX SW version is 1.D1 or later. In WinSetup, click right mouse button
on the present REX device and choose Properties. Under
Communication you can see the label Version telling the REX SW
version. REX SW version 1D.1 will give reduced functionality, according
to "Limited functionality of RDU40." on page 3-2.
The RDU40 for REX cannot be combined with a Slave Data Acquisition
Unit (SDAU). No SDAU shall be configured in holding register 5 in
WinSetup.
All wires are connected correctly.
REX gauge shall not be in boot mode.
Make sure the RDU40 SW version is 1.B1 or later. To check you must
remove the cover on the back of the display. The SW version can be
read from a stick-on label on a PROM, according to Figure 3-2.
Rosemount Tank Radar REX
Chapter 3 Troubleshooting
3-1
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