
122
Chapter 9
Communication with External Equipment (Using the I/O Ports)
Using the I/O Ports
24-bit I/O port
The 24-bit I/O port of the 4294A consists of 4 independent data input/output parallel ports,
several control signal lines, and a power line. All the signals provide TTL level.
The data input/output port consists of 2 sets of 8-bit output ports and 2 sets of 4-bit
bi-directional ports. You can use these ports as up to a 24-bit output port or up to a 8-bit
input port, by using them concurrently.
The input/output signals are preset to negative logic, but you can change the setting to
positive logic. The control signal lines include the measurement completion output or
control signal outputs for handshaking. Figure 9-2 shows the overview diagram of the
input/output ports and the control signal lines.
NOTE
If a device cannot be connected directly to the 24-bit I/O interface connector on the rear
panel of the 4294A, a 36-pin cable (part number: 04278-61650) is available. By connecting
this cable, the distance from the 24-bit I/O interface can be extended by 1 m.
Figure 9-2
Overview diagram of the 24-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 ...
Page 507: ...Index Index 507 Index ...
Page 508: ...508 Index Index ...
Page 509: ...Index Index 509 Index ...
Page 510: ...510 Index Index ...
Page 511: ...Index Index 511 Index ...
Page 512: ...512 Index Index ...
Page 513: ...Index Index 513 Index ...
Page 514: ...514 Index Index ...
Page 515: ...Index Index 515 Index ...
Page 516: ...516 Index Index ...
Page 517: ...Index Index 517 Index ...
Page 518: ...518 Index Index ...