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Manual for BL-521 5_3.doc © Copyright Brainboxes Limited 2004 Page 25 of 41
5. Remote Configuration
A new feature in this release of BL-521 firmware is the ability to remotely configure its settings from a second
Bluetooth device, over a Bluetooth connection. For example, a Bluetooth connection can be created from a second
device and that second device can change the baud rate, local name or any of the settings of the BL-521 over the
Bluetooth link.
This is achieved by the BL-521 presenting two services to connect to; one is the standard serial port service and the
other is a remote configuration service. The latter is connected to, to enable the second device to access the BL-
521’s configuration menu using Hyperterminal and thus make any changes. Changes to port settings such as baud
rate, parity or stop bits do not affect the port settings of the second devices’ Hyperterminal settings, so the BL-521
can be set to 115200, n, 1 and the Hyperterminal settings for the second device that is accessing the BL-521’s
menu remotely can be set to any settings i.e. 9600, e, 2.
Currently the remote configuration feature is not accessible from the main configuration utility application and
Hyperterminal or some other suitable terminal application should be used.
Also, upgrading of the BL-521 cannot be achieved using remote configuration because as soon as the BL-521
starts to upgrade, the Bluetooth connection is lost and there is no longer a way of communicating to the BL-521
remotely.
To use remote configuration from BL-521 to BL-521 use the command line “remcfg=xxxx-xx-xxxxxx” where the x’s
stand for the remote device’s Bluetooth address.
6. Resetting the Product
The BL-521 has a “reset button” located on the side of the case as shown in section 2.1 above. This button
performs 2 different functions.
a) Resets Paired Devices.
A short press (less than 3 seconds) of the reset button causes any paired device information to be deleted.
When the device is in low security mode, this will not have any effect on the devices operation, but whilst in
high security mode, this will mean that another device can pair with BL-521, or that the original device must
expire its bond in order to reconnect.
b) Resets BL-521 to factory defaults.
A long press (more than 3 seconds) of the reset button causes all factory defaults to be restored. Care
should be taken here to remember that these “factory” settings can actually be updated via the interactive
menu and thus may not be the same as the device was shipped with. The user should also remember that
BL-521 is likely to need it’s parameters re-configuring to ensure communications can be re-established with
either the local serial device, or remote Bluetooth device.