User's Manual

OPERATION 5
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HF80 Transponder Reader – HSMS, Release 1.3
5.5.2 HSMS Message Format
This section defines the detailed format of the messages used by the
procedures in the previous section. A HSMS Message is transmitted as
a single contiguous stream of bytes in the following order:
The minimum possible message length is 10 (Header only)
The maximum possible message length depends on SECS I specific.
5.5.3 HSMS Message Header
The Message Header is a ten byte field. The bytes in the header are
numbered from byte 0 (first byte transmitted) to byte 9. The format of
the Message Header is as follows:
Number of
Bytes
Description
4 Bytes
Message Length. MSB first. Specifies the number of
bytes in the Message Header plus the Message Text.
10 Bytes Message Header
0 - n Bytes
Message Text. Format is further specified by P-Type
field of message header. The message text corresponds
to message data by SECSII encoding.
Bytes Description
0 - 1 Session ID (Device ID)
2 Header Byte 2
3 Header Byte 3
4 Ptype
5 Stype
6 - 9 System Bytes