Microhard Systems MHX-900, Operating Manual

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14 MHX-900 Operating Manual: Chapter 3 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 both units for point-to-
point mode. In multipoint
mode, set all Slaves to a
unique Unit Address.
In Point-to-Point, valid Unit
Addresses are 0 to 65535. In
Point-to-Multipoint, valid
Slave Unit Addresses are 1
to 65535.
Ensure that all units within a
network use the same
hopping pattern, and that
multiple concurrent networks
each have different hopping
patterns.
All units within a network
must use the same
encryption key.
S Register 104 - 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.
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.
Default is 0.
S Register 105 - Unit Address
In point-to-point operation, the Unit Address on both the Master and Slave
units must be the same. In point-to-point operation, valid Unit Addresses
range from 0 to 65535. In a multipoint system, the Unit Address uniquely
identifies each Slave from the others.. In a multipoint system, a Slave can
take on any Unit Address between 1 and 65535.
Remember that each Slave should have a Unit Address which is unique from
any other Slave in the network.
Default is 1.
S Register 106 - Hopping Pattern
Since the MHX-900 is a frequency-hopping modem, the carrier frequency
changes periodically according to one of twenty pseudo-random patterns,
selected by defining the Hopping Pattern.
A value from 1 to 20, 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.
Default is 1.
S Register 107 - Encryption Key
The Encryption Key provides a measure of security and privacy of
communications by rendering the transmitted data useless without the
correct key on the receiver. Valid Encryption Keys range from 0 to 65535.
Keep in mind that all units within the network must use the same key for
communications to succeed.