Honeywell Q7055A - Manual (Page 25)

BUILDING NETWORK ADAPTER BNA-1C/2CS/2DN
EN1B-0198GE51 R0801 25
6.2 Operating Modes
The BNA Bootloader provides two different
operating modes:
• Normal Mode
(default)
• Stay in Bootloader Mode
Normal Mode is the default, which directly starts an
application firmware found in Flash memory. If no
firmware could be found, then the bootloader
command shell is started by the BNA (Figure 6-1).
This execution flow can only be influenced by
pressing the Mode Button and changing the mode
to Stay in Bootloader Mode.
Stay in Bootloader Mode interrupts the default
bootloader startup sequence and tells the
bootloader not to start an eventually existing
application firmware in the Flash memory.
6.3 Switching the Operating Mode
In order to switch the Bootloader operating mode, a
pointed object, like an unfolded paper clip or a
sharp pen is required.
For changing the operating modes, there is a time
window of about 3 seconds after reset. The
following steps have to be performed to
successfully change the bootloader mode (Refer
also to Figure 6-2: Switching BNA Operating Mode):
1. Press the Reset Button