NCR RealScan 7802, Руководство пользователя

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NCR RealScan 7802 Price Verifier User Guide
497-0425530 Release E 06/03 45 of 94
Start Event and End Event Masks
Start and end event masks are modes that can be set by UnitConfig. Each mode value
is an 8 hex digit (32 bit) mask that defines the type of device initiating the event as
shown in the table below. Factory default is all masks disabled (00000000). Both start
and end masks are always present in the transmitted packet but one of the two is always
disabled. For most applications the end event mask is not required, therefore leave it
disabled. A start event is a complete packet and an end event is a complete packet.
•
Set the mode values (mask setting) as shown in Table 1
Touch Screen
The touch screen has only start events, however 2 or more touch areas pressed
simultaneously will be recorded and transmitted in the same packet. The clock tick
count in this case is the time elapsed from the prior event
•
Set start mask only.
Mode (Description) Value (Start Mask Setting)
Disable mask (factory default) 00000000
h
Touch panel pressed 00000010
h
Table 1
Data Bytes (Parameters)
Each transmitted event packet contains three 8 hex digit words. Pressing the touch
screen will cause the appropriate data to be stuffed into the parameter words as shown
in the Table 2
Mode (Description) Value (Setting)
Touch Screen
Parameter 0 00000010
h
Parameter 1 scaled y co-ordinate (1-16)
Parameter 2 scaled x co-ordinate (1-12)
Table 2
Structure of EVNT packet
Notes
1. Separate packets will be sent for start events and end events (if used).
2. Pressing the touch screen transmits a (minimum) 33 byte message packet to
the host computer in the following general format.