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9. Connection of the HW 90196 and HW 90195 via radio transmission
9.1 General
The digital radio data transmission allows the application of mobile devices as online-terminals. The loca-
tion independent online-access and/or –transmission of relevant data faciliates timing and coordination of
complex schemes in areas as mobile data registration or catering. The interaction of components in a
local radio communication network will be explained in the following.
The radio base station HW 8660 operates as a crossover for multiple serial interfaces and provides a
network gate for radio connections with TCP/IP. The principle works out as followed:
Program-in/output-data from the server is transmitted via the Base Station to the mobile terminals. The
Base Station serves hereby as a converter translating the relevant data reciprocally into a format that is
readable for serial resp. radio network accesses.
Another function is Roaming. Mobile terminals can be used location independently in a networked envi-
ronment with several Base Stations. The radio connection to a mobile terminal is taken over by the Base
Station with the strongest radio signal. Every communication operation, independend of the range, is
transmitted to the virtual control panel.
This allows many different application possibilities:
The MDE can operate as a mobile terminal with the server running the program and the mobile terminal
presenting the program surface. This way the whole range of standard-TCP/IP-applications can be pre-
sented on a mobile terminal.
Also the mobile terminals can run their own applications. In this case the Base Station can be used to
read master data or sales data for analysis and transmit these to the server. This eliminates the need for
physical temporary storage devices or wired connection of the terminal with the network.
© Höft & Wessel AG
Subject to amendment, errors excepted
User manual
HW90195UserMan.doc
1.0
02.02.2001
Lin
page 54/70
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