STRASBAUGH, INC.
3-2 February 19, 2002 7AF SECS/GEM Interface Ver. 1.9
Strasbaugh Confidential
3.2.3 SECS-I Blocks Received
Blocks received by the Equipment should be formatted as described above (except with the R-bit set to "0"), although the
rules are more relaxed:
1. If a message consists of a single block, the Block Number may be zero (0x0000) or one (0x0001).
2. The Equipment is indifferent to the R-bit setting.
3.2.4 Interleaved Blocks
The 7AF never sends interleaved blocks to the Host. That is, the Equipment always sends all blocks of one message before
sending the first block of the next message. This simplifies the job of the Host.
However, the Equipment allows the Host to send interleaved blocks, if it so chooses.
3.2.5 Simultaneous Transactions
The 7AF may initiate several simultaneous outstanding SECS transactions. That is, the Equipment may send a secondary
primary message before the Host has sent the Reply to a previous primary message. Mainly, this occurs when the
Equipment reports Alarms and Events. The Host can reduce the number of outstanding transactions initiated by the
Equipment by setting Equipment Constants appropriately so that the Equipment sends no W-Bit for Stream 5 (Alarm),
Stream 6 (Event), and Stream 10 (Free Text) messages.
The Equipment allows the Host to initiate at least two (2) simultaneous outstanding transactions.
3.3 SECS-II Clarifications
The 7AF uses the following SECS-II conventions:
3.3.1 Data Format Types
Where the Standards permit a choice of data item types, the choice has been made as described in section "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.
3.3.2 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.
3.3.3 ASCII Data
Unless otherwise specified, all ASCII data items must contain printable ASCII data -- that is, characters in the range 0x20
to 0x7E.
To Next Page
