Setup
1MA236_0e
Rohde & Schwarz
Remote Operation of Windows Based T&M Instruments with Android Tablets
5
For providing the T&M instrument with WLAN access, the following solutions are pos-
sible:
● The T&M instrument is connected by (hardwire) Ethernet with a WLAN router.
In this case the tablet will wirelessly connect to the WLAN router and access the
T&M instrument from there. A group of T&M instruments can use the same WLAN
router. This connection type is called
infrastructure
mode: The WLAN router acts
as WLAN access point which provides the T&M instrument with information to es-
tablish the WLAN connection.
It is recommended to apply DHCP (Dynamic Host Configuration Protocol) on the
WLAN router whereby all address information of the T&M instrument is automati-
cally assigned. Most T&M instruments use DHCP by default.
● The T&M instrument is connected by Ethernet with a network providing wireless
connectivity. In this case the tablet will wirelessly connect to the T&M instrument
via any dedicated WLAN access point provided by the network.
This case is not described in the following sections since configurations and opera-
tion are very similar to the previous case.
● The T&M instrument is equipped with a WLAN USB adapter.
In this case the T&M instrument sets up an own wireless network and the tablet
connects to this network. The devices communicate directly with each other (point-
to-point); no additional WLAN access point is engaged and the T&M instrument is
not available at other WLAN access points. This is the WLAN
ad hoc
mode. Static
address information (no DHCP) is used for the T&M instrument and the tablet. The
connection only has to be configured once, the settings are saved.
A WLAN USB adapter has a range of about 10 m.
Note:
WLAN connections with several WLAN USB adapters in near vicinity would
disturb each other.
For a T&M instrument with WLAN USB adapter, the WLAN infrastructure mode
would also be possible. In infrastructure mode the WLAN USB adapter operates as
a bridge to another WLAN access point (with greater coverage area) and the tablet
connects to the access point. The infrastructure mode with USB adapter is useful if
the distance between controlling tablet and T&M instrument exceeds 10 m.
Note:
A WLAN connection is not as stable as a LAN connection, and sporadic disturb-
ances of the WLAN connection can occur depending on the local conditions.
3
Setup
The setup consists of:
1. Providing WLAN access for the T&M instrument; this can be done in different ways
2. Installing the RDP client App on the tablet
3. Establishing the WLAN connection on the tablet
4. Establishing the RDP connection
