Appendix B BCU (BMTS)
234 BMTW-SVN01F-EN
In most cases, you will perform this operation from the PC Workstation,
as described in the System Programming guide. However, this can also be
done at the BCU using DIP switches.
The reset from the PC Workstation should not be used to clear the data-
base from a BCU that contains an unknown database. When such a BCU
is connected to the workstation, the workstation will interrogate the BCU
about its database and upload any objects contained in the BCU that the
workstation does not know about. It will also send the BCU objects in the
workstation’s database. In this way, the PC Workstation and BCU data-
bases will tend to merge. This is a bad idea. Use the BCU DIP switch
method to clear an unknown database out of a BCU.
The database may be cleared from a BCU using the DIP switches as
follows:
1. Disconnect the Ethernet/ARCNET cable from the BCU.
2. Verify that the green LED is flashing normally—on for a second, off
for a second.
3. With power still applied, change any one of the eight DIP switches.
Switch 8 is probably the best, as it will change the BCU’s device ID
into one unlikely to be used on the site.
4. Watch the red/green LEDs until the green one goes out and the red
one comes on. This signifies that the BCU has detected a changed
DIP switch and is clearing its database.
5. With power still applied, restore the DIP switch that was changed in
step 3. Try to complete this step within a few seconds.
6. Verify that the BCU comes up.
7. If all looks OK, reconnect the Ethernet/ARCNET cable.
Clear Code, Database, RAM, and Reset
When a new version of Tracer Summit software is released, it is some-
times necessary to replace the code in the BCU if a new BCU code image,
BCU.IMG, was included with the new PC Workstation software.
In some cases, for example, a BCU used as a demonstration unit, the ver-
sion of software present in a BCU may be unknown. Such software should
be replaced with the current version.
Code consists of the BCU image software, which is similar to the BIOS in
a PC. See definitions of RAM in “Clearing BCU RAM and Reset” on
Note:
You must disconnect the Ethernet/ARCNET cable. If you do
not, then the PC Workstation may see the temporary existence
of a BCU whose device ID is set by the state of the DIP switches
in steps 4 and 5. If this device ID matches any on the current
site, the PC Workstation will attempt to download that device’s
database to the BCU, possibly resulting in a merged and man-
gled database.
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