ThingMagic Mercury API v1.23.0 - Manual (Page 44)

Advanced Tag Operations
44 Level 2 API
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Reader.read() -Counters resets to 0 at beginning of call and accumulates values until
call completes.
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Reader.startReading() -Counters reset to 0 when Reader.StartReading is called and
accumulate values until StartReading() is called again. Counter values can be
retrieved while the read is still active. Reader.StopReading has no effect on
counters.
Gen2 Standard TagOps
The following tag operations are supported by ALL Gen2 tags and all Reader Types.
Gen2.WriteTag
Writes the specified EPC ID value to the tag. It is preferred over using Gen2.WriteData
because WriteTag will automatically lengthen or shorten the EPC ID, by modifying the PC
bits, according to the Tag EPC specified. If WriteData is used, the specified data will be
modified but the EPC ID length will not be modified.
Note
Gen2.WriteTag will always use /reader/gen2/q =0 if set to Gen2.DynamicQ.
For use with large tag populations a StaticQ appropriate for the population
size should be used to avoid collisions.
Gen2.ReadData
Reads the specified number of memory words (1 word = 2 bytes) of tag memory from the
specified Memory Bank and location.
Note
Currently limited to returning 123 words of data per standalone ReadData
invocation or 32 words when performed as an
Embedded TagOp Invocation .
When used as an Embedded TagOp Invocation the data read can be used an a unique
identifier of the tag by setting /reader/tagReadData/uniqueByData = true. This allows tags
with the same EPC ID but different values in the specified Gen2.ReadData memory
location to be treated as unique tags during inventories.
Note
Specifying 0 (zero) as the data size to read will result in the entire contents of
the specified memory bank (up to the maximums specified above) being
returned.