Owner's manual

Table Of Contents
1.5 SECS-II Clarifications
The Equipment uses the following SECS-II conventions:
1.5.1 Data Format Types
Where the Standards permit a choice of data item types, the choice has been made as described in
Section 4. SECS Message Detail
.
For outgoing messages, the Equipment always sends Data Items of the exact format shown. For some
incoming messages, the Equipment “forgives” minor Host errors. For example, the Equipment may
accept a U1 Data Item where a U2 format was expected. We recommend the Host attempt to use the
formats shown.
1.5.2 Data Item Length Bytes
For messages sent by the Equipment, the number of length bytes in Data Items is always the minimum
required to contain the Data Item length.
For messages received from the Host, the number of length bytes in Data Items can be 1, 2, or 3, provided
that the length parameter can accurately be specified.
1.5.3 ASCII Data
Unless otherwise specified, all ASCII data items must contain printable ASCII data—that is, characters in
the range 0x20 to 0x7E.
1.5.4 Multi-Block Messages
Wherever the Host is supposed to send a single-block message, this Equipment will also accept multi-
block format.
The maximum size for a single SECS message is approximately 1000 blocks (256,000 bytes).
1.5.5 Function Zero
The Equipment sends a Reply message using Function zero (F0) according to the requirements of the
GEM Control State.
Wherever this Equipment expects a Reply message from the Host, the Host can send F0. The Equipment
will instantly abort the outstanding transaction. The Equipment will not take any additional action.
Equipment-to-Host Messages 1-7