Microhard Systems MRX-900, Operating Manual

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10 MRX-900 Operating Manual: Configuration Options
Select a Network Address
and assign it to all units
which will be included in the
network.
Use the same Unit Address
on all units for point-to-point
mode. In multipoint mode,
set all slaves to a unique
Unit Address.
Ensure that all units within a
network use the same
hopping pattern, and that
multiple concurrent networks
each have different hopping
patterns.
3.4 Network Address
The Network Address defines the membership to which individual units can
be a part of. By establishing a network under a common Network Address,
the network can be isolated from any other concurrently operating network
using the same hardware. As well, the Network Address provides a measure
of privacy and security. Only those units which are members of the network
will participate in the communications interchange. Valid values for the
Network Address range from 0 to 65535, inclusive. Choosing the option
from the main menu (option 4) will yield something like the following, after
which up to five digits can be entered, followed by Enter or Return:
Network Address = 39513
ESC to exit
Set Network Address : _
To enhance privacy and reliability of communications where multiple
networks may operate concurrently in close proximity, it is suggested that an
atypical value be chosen – perhaps something meaningful yet not easily
selected by chance or coincidence.
3.5 Unit Address
In point-to-point operation, the Unit Address on all units (Master, Slave, and
Repeater, if applicable) must be the same. In a multipoint system, the Unit
Address uniquely identifies each Slave from the others. This parameter,
whose value can range from 0 to 65535 inclusive, is set in parallel with the
Slave List (described later), so the Unit Address for each slave should be
noted and subsequently added to the Slave List. The parameter is set by
selecting item 5 in the configuration menu, and entering up to five digits
followed by the Enter or Return key:
Unit Address = 23
ESC to exit
Set Unit Address : _
Remember that each Slave should have a Unit Address which is unique from
any other Slave in the network.
3.6 Hopping Pattern
Since the MRX-900 is a frequency-hopping modem, the carrier frequency
changes periodically according one of twenty pseudo-random patterns,
selected by defining the Hopping Pattern. When this option (#6) is chosen
from the configuration menu, something resembling the following appears:
Hopping Pattern = A
ESC to exit
Set Hopping Pattern [A..T] :
A letter from A to T, inclusive, can be used to select the pattern. It is
important that all units which will participate in a network use the same
hopping pattern, or the communication link will fail.