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New ALE Features
This section covers the new ALE features that meet the requirements of
Selective Calling
MICOM 2 supports selective calling as standardized in
ALE Addressing Method
ALE uses digital addresses to identify stations. The fundamental address element in the ALE system is the single word: one ALE address word must always contain three characters (one triplet).
A single ALE word is needed for the basic individual station address (this is called a basic address). To increase the available range of addresses, basic addresses can be expanded up to a maximum of 5 words (15 characters): such addresses are called extended addresses.
The characters that can used in addresses are a subset of the standard Basic 38 ASCII character set. This subset includes:
•All the capital (upper case) letters (A to Z)
•All the digits (0 to 9)
•Two utility characters:
!" The stuffing symbol @. It can be used to add characters at the end of an address, so that the resulting length is a whole number of words (triplets). A receiving station then interprets only the
!" The wildcard symbol ?. It is used to indicate that any character (except @) is acceptable (this is the equivalent of a don’t mind instruction). See Table 2 for utilization guidelines in the special addressing modes.
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