User's Manual

Stollmann
E + V GmbH
BlueMod+B20
Hardware reference
Author: bg Date of Saving: 28.03.07 Ref: BlueMod+B20_HWreference_V101.doc Revision: 1.00 Page 7 of 7
1.2.2 Cable Replacement Multipoint
Since several devices may be connected with a master device via Bluetooth, several
end devices can also be multiplexed via Bluetooth. This adaptation is shown below
for a desktop device.
B
l
u
e
t
o
o
t
h
Multiplxing
protocol
RS-232
BlueRS+
Control Unit
Device
B
l u
e
t
o
o
t h
BlueMod
+B20
BlueMod+
B20
In order to handle multiple links a multiplexing protocol is required for the communi-
cation between devices, the BlueRS+ and the host. The BlueRS+ has to be adapted
to the routing scheme of the protocol to transmit the data in an appropriate way. This
includes Bluetooth connection control (i.e. are the Bluetooth links permanently active
or only on demand) and data distribution (i.e. are all data from the host to be for-
warded to all devices or only depending on the address header; are data from the
devices are transmitted to the host transparently or is an address header to be
added). In case you have a multipoint application please contact Stollmann for spe-
cific support.
1.2.3 Terminal Server
B l u
e t o o t h
RS-232
BlueRS+
Control Unit
BlueMod
+B20
Bluetooth
Terminal
Server
BlueRS+
Bluetooth
RS-232
BlueMod+
B20
BlueMod+
B20