User's Manual Part 1

13,56 MHz Multitag Reader Module, Version 0.9v
ACG Identification Technologies AT Page 36
5.3.17 Transfer data telegram
This command sends a custom data block to a card. First the proper tag type has to
be specified using the set tag type command. The reader device only supports
ISO15693. The command shows a specific command frame for each tag type.
The maximum frame size is limited to 200 bytes each.
5.3.17.1 ISO15693
The reader set the according flag of the protocol automatically. Only FM and high
data rate can be used.
5.3.17.2 Command
Command Data
‘t’ Downlink length (1 byte) + Uplink length (1 byte) + data (n
bytes)
5.3.17.3 Answer
Answer Description
data Response of card
‘F’ Error: General failure
5.3.17.4 Downlink length
The downlink length includes only the data. The CRC is computed automatically and
shall not be included.
5.3.17.5 Uplink length
The uplink length is need due to no length information is included in the protocol. The
user has to know the exact response length of the command. The CRC shall not be
included in the length.
5.3.17.6 Data
Data consists of following frame.
Flags Command code UID Data
(1 byte) (1 byte) (8 bytes) (n bytes)
Figure 5-17: ISO15693 data frame