Nanometrics RM-4, Руководство пользователя

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Internet Timeserver Setup
Discussion
An RM-4 equipped with the optional GPS engine can be used as an Internet timeserver. The setup
for this use of an RM-4 is shown below. Serial data streams can be accepted by the RM-4 in this
configuration as well.
G P S
Antenna
Assembly
G P S
Cable
L A N
Cable
RM-4
with
G P S
5 V
Power
Supply
110/220 V
A C
Figure 4: Typical Internet Timeserver Setup
Using the RM-4 with Spread Spectrum Radio Transceivers
Discussion
The Europa digitisers with spread spectrum radios can be configured to operate in point-to-point
mode as well as in point-to-multipoint mode. In point-to-point mode, a pair of radios are required for
each link, i.e., one radio (the slave) is required for the digitiser and one radio (the master) is needed
at the RM-4 site which receives the digitiser data. In point-to-multipoint mode several radios
(slaves), each associated with a digitiser, can be multiplexed into one data stream and delivered to
the RM-4 site containing the master radio. In addition, the spread spectrum radio transceivers can
be configured as radio repeaters to increase the flexibility of the data acquisition network topology.
The spread spectrum radios must be configured to the appropriate role within the network. The
configuration menu is described in the Freewave Spread Spectrum Wireless Data Transceiver User
Manual.
In general, the operation of the spread spectrum transceivers is transparent to the RM-4. The
transceivers effectively function as a 9-pin null modem in virtually any environment where RS232
data communications occur. The serial port of the master radio is connected to one of the serial
RM-4 Manual 11
4 - User Guide