Team, Customer is going to use XR480 in standalone mode e.g. the application runs on the XR itself. This is a conveyor-like application where tags should be read immediately re-programmed with the different information. The software developer facing the following issues: 1. If they use on-demand read mode the read cycle ( RFID_ReadTagInventory call) lasts several seconds - they claim it's around 7 secs even with the minimum inner and outer loop values. As the tag inventory call locks the application while reading they have to wait until it finishes before starting to write and this interval is not acceptable for their app. 2. In autonomous mode the read speed is obviously fine but they have to switch to on-demand mode in order to write otherwise the app hangs when attempting to write - and this also takes ~4 secs which is unacceptable as well. They tried to use a separate thread for writing but the app return "engine busy" error when the write thread tries to set the write mask. 3. They tried to use on-demand with tag read event handler as desribed in the XR C API doc hoping that they would be able to process tags from thr resad queue before tag inventory cycle finishes - but claim that while they're able to catch the event still they're unable to figure out what tag has been actually read (TYPE_TAG or TYPE TAG_EX structures remain empty) Now questions part: 1. What is the minimum interval for RFID_ReadTagInventory or RFID_ReadTagInventoryEX calls and how to achieve this minimum? Can RFID_GetTagID be used instead? Is it faster? 2. Is it possible to write tags while remaining in autonomous mode? If not - why it takes so long to switch to ondemand mode? 3. Is it possible and what is the right way (sample would be great) to use tag event handler in ondemand mode to extract tags from the read queue and program them in a separate thread without waiting for ReadTagInventory to finish? Thanks, Valery