DL8000 Preset Instruction Manual
D-70
Communications Protocols
Revised February-2016
Enhanced Request Status
[0x3C]
This command can be issued at any time to know the overall status of DL8000
unit. This command is an alternative to Request Status command [0x12].
This command has the following
advantages
over the Request Status [0x12]
command:
Its response contains the recipe number, additive selection, and preset
volume. The Request Selected Recipe [0x02], Request Selected Additives
[0x04], and Request Preset Volume [0x09] commands may no longer be
required; the relevant data are available to the TAS immediately when the
corresponding status bits change. Response times are improved.
Its response contains the transaction storage status. The Request
Transaction storage status command [0x1E] may no longer be required.
This is particularly useful for “ticket printing” systems that upload batch and
transaction data by watching for new records being written into the files.
This command has the following
disadvantages
over the Request Status
[0x12] command:
Its response time is slightly slower, but not significantly slower.
Since there are no exceptions, it does not protect the TAS from making
mistakes (such as using a recipe number when no recipe is selected and
no transaction is authorized).
For the command response, see Results section below.
Status flags is a binary representation of the DL8000’s 32 status flags.
Safety circuit status is the current logical state (“open” or “closed”) of 8 general
purpose safety circuit inputs. The least significant bit is safety circuit 1 etc. If
you do not configure safety circuit input, then the value of bit for respective
safety circuit will be equal to unsafe state [0].
Alarm bitmaps indicate active (raised and reset) alarms. The automation
system can maintain a copy of the “alarm bytes” so that it can determine (for
logging purposes) when alarms are raised or cleared.
The recipe number is valid while the recipe selected or the transaction
authorized bits are set. (The recipe number authorized for the transaction need
not be the same as the recipe number selected by the operator)
The additives selection bitmap is valid while the additives selected status bit is
set.
The preset volume entered is valid while the preset volume entered or batch
authorized status bits are set. For the former, it is the preset volume entered
by the operator. For the latter, it is the preset volume authorized for the batch.
(The preset volume authorized for the batch need not be the same as the
preset volume entered by the operator).
Flags Immediately Set
None
Flags Immediately
Cleared
None
Exceptions
None
Supporting Parameters
As above
Содержание DL8000
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