252301 Issue 2.0.pdf - 第146页

GEM Manual for DEK Printers Additional Capabilities I ssue 2.0 June 9th, 2011 page 146 of 156 10.4.2 Verification State Model Each verifia ble item maintains a state machine in o rder to track its status. The mode l is u…

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GEM Manual for DEK Printers Additional Capabilities
Issue 2.0 June 9th, 2011 page 145 of 156
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10.4 Process Verification
Functionality is provided to allow the host computer to monitor the printer regarding the type of certain
consumable items. Consumable items to be monitored will be fitted with RFID tags. RFID antenna
located in appropriate places within the machine will be able to read the consumable identification
information stored in the tag and relay it to the factory host. The host is notified of the consumable
item ID using collection events. When the host is notified of the ID it can verify whether the item is
suitable for the current process and respond with a message indicating whether the item is correct.
If Process Verification is enabled all consumable items must be of the required type before the item can
be used. For example a print run or paste dispense will be prevented from starting if the transfer
material is of the wrong type.
The consumable items that can be monitored are:
• Transfer Material – e.g. flux or solder when applied via a Paste Dispenser or ProFlow.
There are a number of Process Verification related configuration parameters. These are detailed in the
table below:
DISPLAY NAME DESCRIPTION Value Range
Max Tag Read Attempt Used to control the maximum number of RFID
Tag read attempts. If the printer fails to read a
tag it will retry until this limit is reached.
1- 3 - 10000
SC Verif Timeout Used to control the maximum response time for
the host to return a verification verdict. The
timer is started when the printer notifies the host
of the read RFID Tag data
1- 120 - 600 s
Max SC RFID Notifies Used to control the maximum number of times
the printer attempts to notify the host of the read
RFID Tag data in the event of the host failing to
reply within the SC Verif Timeout period.
1- 3 - 10000
Note: Default values are shown bold.
10.4.1 Enable / Disable Item Verification
In order to enable or disable material verification the host must set an Equipment Constant to the
appropriate value. ECV = 0, verification disabled, ECV = 1, verification enabled. The EC value can
also be changed via the corresponding configuration parameter.
GEM Manual for DEK Printers Additional Capabilities
Issue 2.0 June 9th, 2011 page 146 of 156
10.4.2 Verification State Model
Each verifiable item maintains a state machine in order to track its status. The model is used to
synchronise the actions of the host and printer. The following diagram illustrates the form of the state
machine.
GEM Manual for DEK Printers Additional Capabilities
Issue 2.0 June 9th, 2011 page 147 of 156
Transition Table:
# Current State Trigger New State Action
Initial Model Instantiated Disabled None
1 Disabled Verification Enabled Unread None
2 Unread Cover Closed, System Up Reading Tag Read Tag,
listen for response
3 Reading Tag Read Complete / UID value
changed or verification status
not received for current UID
Verification Pending Notify host, listen for
response
4 Verification
Pending
Set verification invalid status /
UID in sync with host
Invalid None
5 Verification
Pending
Set verification valid status /
UID in sync with host
Valid None
6 Verification
Pending
Set verification overridden
status / UID in sync with host
Overridden None
7 Invalid Host sets verification
overridden status
Overridden None
8 Overridden Host clears verification
overridden status
Unread None
9 Verification
Complete
Cover Closed, System Up Reading Tag Read Tag,
listen for response
10
Reading Tag Read Complete / UID value
unchanged and verification
status previously received for
current UID
Return to previous
Verification
Complete substate
None
11
Verification
Pending
Verification Timeout Error None
12
Error Cover Closed, System Up Read Tag, listen for response
13
Error Operator requests revalidation
Verification Pending None
14
Verification
Pending
Cover Closed, System Up Reading Tag Read Tag,
listen for response
15
Valid Host sets verification invalid
status
Invalid None
16
Enabled Verification Disabled Disabled None
17
Error Host sets verification valid
after the timeout period
Valid None
18
Overridden Host sets verification valid
after a previous override
Valid None
The host has access to an item state machine via an Equipment Constant. In accordance with the state
machine detailed above the host is able to set the EC value to one of:
• Unread, ECV = 1.
• Invalid, ECV = 4.
• Valid, ECV = 5.
• Invalid, ECV = 6.
In order for the printer to accept the values Invalid, Valid and Overridden as well as the state machine
being in the appropriate state, the value of the corresponding SCValidatedUID EC must reflect the item
identification last read from the RFID antenna.