Agilent Technologies 4294A Service Manual download pdf (Page 124)

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124 Chapter 9

Communication with External Equipment (Using the I/O Ports)

Using the I/O Ports

When this input falls (a pulse is inputted), the OUTPUT1 output and the OUTPUT2 output

go LOW or HIGH. The delay between the fall of the input and the state transition of both

outputs is 200 ns (typical). To select LOW or HIGH of both outputs, use the GPIB

command. The pulse width of a signal inputted to INPUT1 must be 1 μs or more.

OUTPUT1 output, OUTPUT2 output

These signal lines are latched output terminals that can be set to LOW or HIGH by a rise of

the INPUT1 input or the GPIB command.

PASS/FAIL output

Outputs HIGH (for positive logic) or LOW (for negative logic) when the limit test result is

PASS; LOW (for positive logic) or HIGH (for negative logic) when FAIL. This is available

only when the limit test function is on.

Write strobe output for PASS/FAIL output

When the limit test result is outputted to the PASS/FAIL output line, a negative pulse is

outputted to this write strobe output. The outputted pulse width is 10 μs (typical). This

output signal notifies external equipment that the limit test result is outputted to the

PASS/FAIL output.

SWEEP END output

Outputs a negative pulse when the 4294A completes a sweep. The outputted pulse width is

20 μs (typical). If the continuous sweep trigger is sent, a pulse is generated each time a

sweep is completed.

+5V output

Provides a +5V output for external equipment. The maximum supply current is 100 mA.

This line has no fuse, but, if over-current flows, the protection circuit of the 4294A

operates and the main power to the 4294A is automatically cut off. When the cause of

over-current is removed, the power to the 4294A is restored, but the instrument states are

reset to the power-on states.

Definition of I/O pins

Figure 9-4 shows pin numbers, and Table 9-1 shows the relationship between signal lines

and pin numbers.

Figure 9-4 Pin numbers of the 24-bit I/O port connector

1 2 ... 119 120 121 122 123 124 125 126 127 128 129 ... 517 518

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Agilent Technologies 4294A Service Manual Page 124

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