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Chapter 9
Communication with External Equipment (Using the I/O Ports)
Using the I/O Ports
Using the I/O Ports
8-bit I/O port
The 8-bit I/O port of the 4294A consists of the following TTL signal lines.
•
OUT0 to OUT7 (8-bit output)
•
IN0 to IN3 (4-bit input)
•
GND (ground)
Definition of the I/O pins
Each signal of the 8-bit I/O port is described below. Figure 9-1 shows the pin assignment
diagram.
OUT 0 to 7
Signal lines that can be set freely from the controller. Use these lines to
send signals from the controller to external equipment. Once signals
are outputted form the controller, the states of these signal lines are not
changed until the controller outputs the next signals (latched).
IN 0 to 3
Signal lines that can be read out from the controller. Use these lines to
send signals from external equipment to the controller.
GND (3 pins)
Ground line.
Figure 9-1
8-bit I/O port
Summary of Contents for 4294A
Page 4: ...4 ...
Page 18: ...18 Contents ...
Page 24: ...24 Chapter1 To make effective use of this manual Other manuals attached to this unit ...
Page 94: ...94 Chapter6 Reading Writing Measurement Data Reading Writing Data ...
Page 110: ...110 Chapter7 Processing Measurement Results Analyzing Measurement Results ...
Page 136: ...136 Chapter10 Handling Errors Sample program for error handling ...
Page 246: ...246 13 Application Sample Programs File Transfer Function ...
Page 254: ...254 Chapter15 Setting the Display LCD Sample program for setting the LCD screen ...
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