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Appendix 1. Advanced Topics
Appendix 1.1. Can I use only Passive Client mapdescs ?
No. A passive client map descriptor must be used after an active RDBC map descriptor. The driver uses the active map descriptors to poll the Controller and then searches for Passive Client map descriptors with matching Node_Name and Gar_Cmd fields. It then stores the data items as specified by the Gar_data field from the data collected by the preceding active map descriptor.
Appendix 1.2. Data length of specific polls versus “All” data polls
The length of the data packet retrieved from the Controller during a poll is always fixed for each of the three types of data polls. When specifying a specific Gar_data item on a RDBC active map descriptor, the driver still gets all data of Gar_cmd type from the controller in a single poll, but only stores the data item in question.
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