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Appendix A. Advanced Topics
Appendix A.1. Specifying a Poller Map Descriptor length
The poller Map Descriptor is responsible for checking a remote MXL/XLS device for events. When events are received the poller Map Descriptor increments counters at various offsets in the Data Array specified by the poller Map Descriptor. The offsets and their meanings are explained under the Client configuration section of this Driver Manual.
The poller Map Descriptor’s Data Array contains sets of 19 elements or counters. Each set of counters represents the events from a panel. The Block_Number is used to specify the lowest panel number from which events will be received. The highest Node_ID of any passive Map Descriptor on the same port as the poller Map Descriptor specifies the highest panel number from which events will be received. The poller Map Descriptor’s length has to be at least 19 and has to incremented by 19 for every extra panel above the Block_Number from which events will be received.
If a poller Map Descriptor length is set below 19 and for example, event “System Reset” is received which needs to be mapped at offset 18 in the Data Array, the following kernel message will be printed:
“Cannot store alarm event type counts!”, 11010” ‘offset=%u,da=%s”
Example 1: Only receive events from panel 7
•Passive event Map Descriptor’s Node Id = 7 (X)
•Poller Map Descriptor’s Block_Number = 7 (Y)
•Poller Map Descriptor’s Length = (X – Y) * 19 + 19 = 19
•Event counters for panel 7 will reside in the first 19 elements.
Example 2: Receive events from panel 7 and 6
•Passive event Map Descriptor’s Node Id = 7 (X)
•Poller Map Descriptor’s Block_Number = 6 (Y)
•Poller Map Descriptor’s Length = (X – Y) * 19 + 19 = 38
•Event counters for panel 6 will reside in the first 19 elements and those for panel 7 in the next 19 elements.
Warning: An error will be generated when an event arrives from a panel with a number lower than the Block_Number of the poller. The poller Map Descriptor’s Block_Number must equal the lowest panel number for which a passive Map Descriptor exists on the same port.
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