Specifications

Using the Status System
The VT1419A’s Status System allows a single register (the Status Byte) to be
polled quickly to see if any internal condition needs attention. Figure 3-11 shows
that the three Status Groups (Operation Status, Questionable Data, and the Standard
Event Groups) and the Output Queue, all send summary information to the Status
Byte. By this method, the Status Byte can report many more events than its eight
bits would otherwise allow. Figure 3-12 shows the Status System in detail.
Programming the VT1419A Multifunction
Plus
Using the Status System
88 Chapter 3
Q
uestionable Data Group
Operation Status Group
Standard Event Group
Group Summary Bits
Status Byte
Output
Queue
Read with
*STB
Figure 3-11: Simplified Status System Diagram
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