Moore Industries WLM, Руководство по установке

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12 The Interface Solution Experts
WLM
Main Menu Option (3): Edit Radio Transmission Characteristics
When option (3) is selected in the main menu, the screen in figure 4 appears, which allows the user to modify the
radio transmission characteristics of the radio modems. As stated in the warning, these parameters are for the
experienced user who has a good understanding of the principles of radio data transmission. They should be
changed only after consulting this manual.
It is important to note that the radio parameters between any radio modems in communication will be determined by
the settings for the master (except when in multi-point mode, see (4) RF Data Rate and (5) RF Power below). While
the settings may be modified for the remote(s) and/or repeaters, they will be overridden by the master’s parameters.
Note
: For most Ethernet applications, these settings are already optimized. Please consult with Moore
Industries-International, Inc. before making changes.
Figure 4: Radio Parameters Menu
Shown below are example settings. Please refer to supplied configuration sheets for your modem’s configuration.
(0) FreqKey
Selection (0) in the Radio Parameters menu allows the user to modify the hopping patterns of the radio modems
to minimize the interference with other WLM radio modems in operation in the area. For instance, if there
were 10 pairs of WLMs in operation within a factory or refinery, changing the Frequency Key would ensure
that they would not jump onto the same frequencies at the same time for the same length of time.
There are 15 choices available for the Frequency Key (0-9 and A-E). It is recommended that a list be maintained
of the settings for each master to ensure that each is set to a different hopping pattern.
(1) Max Packet Size and (2) Min Packet SizeSelections
(1) and (2) allow the user to designate the size of the packets (in bytes) used by the radio modem in its
communications link. This may be of particular value when using the WLM with different
communications software packages; you may find that throughput is optimized when packet sizes are
restricted by the radio modem.
Packet size is determined by a combination of the settings entered by the user and the RF Data Rate. In
addition, the Max Packet Size is a function of the setting selected for the Min Packet Size. Tables 2, 3 and 4
provide the packet sizes for each different combination of settings.