Switch Role; Class Of Device; Handshaking; Connect Scheme - Brainboxes BL-819 Product Manual

1.9.6. Switch Role

This Function will allow an RS-232 Bluetooth Adapter to connect to another device as a Client, then when the connection has
been made, to switch the role to Server. This option is required if you wish to connect two or more adaptors to a control
device, with the adaptors initiating the connection. NB, the adaptors are only capable of being connected to one other device
at time.

1.9.7. Class of Device

Some remote device applications will only communicate to devices of a certain type. This option allows you to reconfigure
your RS-232 Bluetooth Adapter to appear as a number of different device types. The Factory setting for the Class of device is
"Peripheral". The available options are: Peripheral, Desktop, Laptop, Imaging, Phone/Modem and LAN.
IMPORTANT NOTE: Changing this Class of Device setting does not alter the published functionality of the product. It will
continue to offer ONLY One Serial port profile connection.

1.9.8. Handshaking

This setting allows the user to select the handshaking scheme used for the device. By default the setting is no handshaking.
Handshaking options are RTS/CTS, DTR/DSR, RTS/CTS & DTR/DSR or none. When changing between handshaking options, a
power cycle is required before the configuration utility can be re-accessed.
RTS/CTS handshaking is used between the Adapter and the port to which it is connected (hardware handshaking). DTR/DSR
handshaking is used over the Bluetooth connection between the adapter and the device to which it is connected via
Bluetooth (over-the-air handshaking).
As shipped from the factory, this product is configured NOT to require the use of RTS/CTS handshaking. Its implementation is
such that these control signals are NOT transferred over the Bluetooth link, but instead are used to control the passage of
data between the adapter and the physically connected RS-232 device (PC, modem etc.). It is therefore not possible to use
this product in an application that uses the RTS and/or CTS handshake lines for purposes other than simply to control the flow
of data.
Whilst the Adapter is configured NOT to require RTS/CTS handshaking, some devices to which it may be connected will
require this flow control. If this is the case, unless the following procedures are undertaken the Adapter will not send any data
and the communications between the 2 devices will appear corrupt or broken.
Whilst the product ships without handshaking to make initial configuration easier, Brainboxes do not recommend that you
leave RTS/CTS handshaking disabled unless you are connecting the Adapter to a device that specifically does not use any
itself. This handshaking exists to ensure that no data is lost between the 2 devices. In applications where there is a significant
amount of data flowing between devices, there is an increased risk of data being lost. Disabling handshaking unnecessarily
may cause your application to fail intermittently due to this lost data.
No provision has been made in the current design for the implementation of the DCD and RI lines.

1.9.9. Connect Scheme

This allows the selection of a connection scheme called Proximity. This connection scheme tells the adapter to go out, find
the first Bluetooth device in range and connect to that device. If there are any problems connecting or pairing, then the
adapter will give up and go out to search again.
There are two different proximity schemes, 1 and 2. Scheme 1 finds a device to connect to and then saves that device's
address as its partner device, so that the next time the adapter is powered up, it will always connect to that partner device.
Scheme 2 finds a device to connect to and doesn't save that device's address, so that next time the adapter is powered up, it
will go out and find a new device to connect to again. It may be the same device as last time (if it is still in range) or it may be
a new device.
The closest device to the adapter is not necessarily going to be the device that responds to the inquiry first. The adapter
needs to be in Client mode for Proximity to work and as soon as a partner address is populated in the partner address field,
the adapter behaves just as though it is in Client mode with a partner device to connect to.
Manual for BL-819, BL-830, BL-875
V6.1
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