Martin,
below you'll find a SET_READER_CONFIG message in LTK-XML that sets the
transmitter power (see <llrp:RFTransmitter>). In your c code, you'd need
to load this LTK-XML message, convert it to the binary LLRP format and
then send it to the reader. Alternatively, you can also the LLRP
Commander (www.fosstrak.org/llrp) to communicate with the LLRP reader.
If you want to change the transmit power dynamically, here is some
sample LTKJava code:
//load message
LLRPMessage m = Util.loadXMLLLRPMessage(new File("SET_READER_CONFIG.xml"));
SET_READER_CONFIG myReaderConfig = (SET_READER_CONFIG) m;
// change transmit power to "power"
myReaderConfig.getAntennaConfigurationList().get(0).getRFTransmitter().setTransmitPower(new
UnsignedShort((short)power));
// send it off
myReaderConnection.transact((LLRPMessage)myReaderConfig,1000);
Hope this helps,
Christian
<?xml version="1.0" encoding="UTF-8"?>
<llrp:SET_READER_CONFIG
xmlns:llrp="http://www.llrp.org/ltk/schema/core/encoding/xml/1.0";
Version="1" MessageID="3">
<llrp:ResetToFactoryDefault>0</llrp:ResetToFactoryDefault>
<llrp:ReaderEventNotificationSpec>
<llrp:EventNotificationState>
<llrp:EventType>Upon_Hopping_To_Next_Channel</llrp:EventType>
<llrp:NotificationState>0</llrp:NotificationState>
</llrp:EventNotificationState>
<llrp:EventNotificationState>
<llrp:EventType>GPI_Event</llrp:EventType>
<llrp:NotificationState>0</llrp:NotificationState>
</llrp:EventNotificationState>
<llrp:EventNotificationState>
<llrp:EventType>ROSpec_Event</llrp:EventType>
<llrp:NotificationState>1</llrp:NotificationState>
</llrp:EventNotificationState>
<llrp:EventNotificationState>
<llrp:EventType>Report_Buffer_Fill_Warning</llrp:EventType>
<llrp:NotificationState>0</llrp:NotificationState>
</llrp:EventNotificationState>
<llrp:EventNotificationState>
<llrp:EventType>Reader_Exception_Event</llrp:EventType>
<llrp:NotificationState>0</llrp:NotificationState>
</llrp:EventNotificationState>
<llrp:EventNotificationState>
<llrp:EventType>RFSurvey_Event</llrp:EventType>
<llrp:NotificationState>0</llrp:NotificationState>
</llrp:EventNotificationState>
<llrp:EventNotificationState>
<llrp:EventType>AISpec_Event</llrp:EventType>
<llrp:NotificationState>1</llrp:NotificationState>
</llrp:EventNotificationState>
<llrp:EventNotificationState>
<llrp:EventType>AISpec_Event_With_Details</llrp:EventType>
<llrp:NotificationState>0</llrp:NotificationState>
</llrp:EventNotificationState>
<llrp:EventNotificationState>
<llrp:EventType>Antenna_Event</llrp:EventType>
<llrp:NotificationState>0</llrp:NotificationState>
</llrp:EventNotificationState>
</llrp:ReaderEventNotificationSpec>
<llrp:AntennaConfiguration>
<llrp:AntennaID>1</llrp:AntennaID>
<llrp:RFTransmitter>
<llrp:HopTableID>1</llrp:HopTableID>
<llrp:ChannelIndex>1</llrp:ChannelIndex>
<llrp:TransmitPower>65</llrp:TransmitPower>
</llrp:RFTransmitter>
</llrp:AntennaConfiguration>
<llrp:ROReportSpec>
<llrp:ROReportTrigger>Upon_N_Tags_Or_End_Of_ROSpec</llrp:ROReportTrigger>
<llrp:N>100</llrp:N>
<llrp:TagReportContentSelector>
<llrp:EnableROSpecID>1</llrp:EnableROSpecID>
<llrp:EnableSpecIndex>1</llrp:EnableSpecIndex>
<llrp:EnableInventoryParameterSpecID>1</llrp:EnableInventoryParameterSpecID>
<llrp:EnableAntennaID>1</llrp:EnableAntennaID>
<llrp:EnableChannelIndex>1</llrp:EnableChannelIndex>
<llrp:EnablePeakRSSI>1</llrp:EnablePeakRSSI>
<llrp:EnableFirstSeenTimestamp>1</llrp:EnableFirstSeenTimestamp>
<llrp:EnableLastSeenTimestamp>1</llrp:EnableLastSeenTimestamp>
<llrp:EnableTagSeenCount>1</llrp:EnableTagSeenCount>
<llrp:EnableAccessSpecID>1</llrp:EnableAccessSpecID>
</llrp:TagReportContentSelector>
</llrp:ROReportSpec>
<llrp:AccessReportSpec>
<llrp:AccessReportTrigger>End_Of_AccessSpec</llrp:AccessReportTrigger>
</llrp:AccessReportSpec>
<llrp:KeepaliveSpec>
<llrp:KeepaliveTriggerType>Periodic</llrp:KeepaliveTriggerType>
<llrp:PeriodicTriggerValue>5000</llrp:PeriodicTriggerValue>
</llrp:KeepaliveSpec>
<llrp:EventsAndReports>
<llrp:HoldEventsAndReportsUponReconnect>1</llrp:HoldEventsAndReportsUponReconnect>
</llrp:EventsAndReports>
</llrp:SET_READER_CONFIG>
Martin Li Causi wrote:
> Hi! my name is Martin Li Causi, I work at a food company in Argentina.
> We implemented a control system with RFID , and bought two reader impinj
> speedway.
> I'm working on the software and I am having a problem. I'm putting my
> software in C, and draw from the program that is in www.llpr.org
> (llpr_toolkit for language c)
> I want to change the power of the reader equipment, but I can´t do it.
> I wondered if you could help me do this or have any sample program??
> thank you very much!!!
>
> Yours sincerely
> Martin Li Causi
>
>
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>
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>
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