Chapter 10 BCU operation and communication status
118 BMTX-SVN01C-EN
LEDs for operation status
During BCU startup and reset operations, a sequence of codes appears on
the seven-segment LED display (see Figure 39 on page 117 for its loca-
tion). A decimal point appears on the seven-segment LED display at U1
when the processor is busy. The decimal point disappears when the pro-
cessor is idle.
During normal operation, the decimal point will flicker, with occasional
longer flashes. If the decimal point appears continuously for more than a
second or two at a time, it may indicate that the BCU is overloaded. Dur-
ing normal operation, the BCU will also show a repeating “dancing dash”
pattern on the display: bottom segment, middle segment, top segment,
middle segment. See Table 29 for a complete listing of codes and their
meaning.
Standard sequences of the seven-segment LED display that appear dur-
ing startup and reset operations are described in “Startup sequence pro-
cedures” on page 119 and “BCU reset procedures” on page 120.
Table 29. LED codes for BCU operation status
Code Meaning
“Dancing dash” (dashes
flash one at a time)
Normal operation with program (database).
8 Processor in reset, or no functioning software. A persistent “8” means that service is
required.
7 Starting boot loader
6 Searching for main code file
5 Searching for main boot loader file
4 Loading and verifying code or boot file
3 Initializing hardware
2 Testing non-volatile RAM
1(Not used)
0 Non-volatile RAM intact after power fail. Returning to interrupted program.
-C No code, or code is corrupt. Waiting for PC Workstation to send code.
Cd Code being downloaded.
E Erasing non-volatile RAM. Turn power off within 10 seconds to avoid erasing code.
EC Erasing main code. Waiting for PC Workstation to send code.
F Error during normal operation. Cycle power to restore normal operation.
-H Code download complete, but DIP switches are all On. Turn off power to the BCU and set
the switches to the desired device ID.
H Displayed during start-up sequence to show high capacity (???). Also shown to indicate
power fail shutdown completed. This will appear briefly when power is turned off. It may
persist if there is a sustained brownout below proper operating voltage.
J Restart due to BACnet or mini-monitor command. This should be shown for only a sec-
ond or two before a reset sequence begins.
-P No program (database). Waiting for PC Workstation to send program.
Pd Program (database) being downloaded.
F(Not used)
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