Functional Description
1MA236_0e Rohde & Schwarz Remote Operation of Windows Based T&M Instruments with Android Tablets 4
2 Functional Description
The "Remote Desktop" functionality for controlling the T&M instrument by tablet com-
prises the following main characteristics:
● The T&M instrument acts as server and generates content which is transmitted to
the tablet and shown on its display; the tablet is the client. The display of the tablet
shows the same content as a T&M instrument's display would do.
● In the opposite direction, the tablet transmits commands from its user interface
(touch screen) to the T&M instrument which determine its behaviour.
● An appropriate protocol controls the data exchange between T&M instrument and
tablet.
The "Remote Desktop" functionality is realized by Microsoft's Remote Desktop Protocol
(RDP). The RDP software consists of a server and a client component. On Windows
systems the server and client components are included in the Windows operating sys-
tem. Thus, the T&M instrument operating on Windows is ready for RDP. On the tablet,
RDP client software which is appropriate for the client's operating system has to be
installed.
VNC (Virtual Network Computing) is an alternative to RDP. VNC also allows to control
a T&M instrument from a remote computer as if working on the instrument locally. It
uses similar concepts as RDP but is independent of the operating system.
WLAN Connection
WLAN is used for the wireless connection between T&M instrument and tablet.
Fig. 1 illustrates one possible realization with an intermediate WLAN router.
Fig. 1: T&M instrument connected with tablet via WLAN router
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