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9.2 Data transfer with an ID tag
9.2.1 Read UID of the ID tag
The UID (Unique Identification Number) of the ID tag is available in object 0x2180
as soon as an ID tag is within the reading range of the device. If no ID tag is
available, the value 0x0000000000000000 is entered.
If the object is mapped on a TPDO, transmission is event-controlled as soon as an
ID tag enters the reading range or is removed from the reading field.
For 32-bit controllers, the following objects are used instead of object
0x2180: 0x2190 and 0x2191.
9.2.2 Read data from the ID tag via PDO transfer
The transfer of the PDO data from the ID tag is event-controlled. That means that
the configured TPDOs are automatically transmitted by the device when the data
change. This is the case, for example, when a new ID tag is detected in the
detection range of the device. The data is automatically read by the ID tag and
transferred by means of the TPDOs via the CAN bus.
The data that was read by the ID tag and assigned to a TPDO is in the objects
0x220A with the sub-indices 0x01-0x40.
Only that data is read by the ID tag that is assigned to a TPDO. Data
objects that are not assigned are not updated automatically.
There are two objects for each data object that are used for configuration:
• 0x2200 (read start address),
• 0x2201 (read length) with sub-indices matching the data object.
The start address in the user data area of the ID tag and length of the files to be
read are set in the objects.
For 32-bit controllers, the object 0x220B must be used instead of object
0x220A. The maximum data length is restricted to 32-bit data (4 bytes).
If the configured data length is smaller than the data length of the object
used (64 bits or 32 bits), the remaining bits are filled with 0.
Max. 64 bits or 32 bits can be transmitted in one TPDO. For the
transmission of larger amounts of data, further TPDOs are assigned and
the corresponding data objects are configured.
