supports 256 system address labels but the DD-42900 has only 128 memory locations. How do I receive data for systems that have more than 128 addresses?
A. Most ARINC-429 avionic subsystems only require the data from a few addresses. It is in these cases that the DD-42900 works hardest for the system designer by providing the functionality needed by sorting and storing only the data that the system needs and ignoring all the rest. If, however, a system requires all or most of the data to be received, this can be accomplished by using the wild card features in the Data Match Table. The Data Match Table architecture provides a lot of functionality that may not be obvious to the system designer. For example, if a system designer wished to receive data from most addresses, but not all, the designer can program those addresses NOT desired first in the Data Match Table and then place a wild card in the Data Match Table. Since the DD-42900 scans the Data Match Table from the beginning for each word received, the data not desired will be stored in locations which can be ignored by the system. The location corresponding to the wild card locatio
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