User's Manual

Brooks Automation
260301 Revision A 59
ATR60LF RFID Reader CAN Bus 7 Operation
Product Manual 7.5 Operation of the SECS Protocol
HSMS message
format
This section defines the detailed format of the messages used by the
procedures in the previous section. An HSMS message is transmitted as a
single continuous 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.
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 SECS-II
encoding.