Agilent Technologies 4294A Service Manual download pdf (Page 127)

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Chapter 9 127

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

Using the I/O Ports

1. Chapter Title

2. Chapter Title 3. Chapter Title

9. Communication with

5. Chapter Title

Exernal Equipment

(Using the I/O Ports)

Preset states at power-on

The 24-bit I/O port is set at power-on as follows (not affected at reset).

Logic Negative logic

Write strobe signal HIGH

SWEEP END signal HIGH

Port A Negative 0 Æ HIGH

Port B Negative 0 Æ HIGH

Port C Input

Port D Input

OUTPUT1 HIGH, HIGH at the fall of the INPUT1 input

OUTPUT2 HIGH, HIGH at the fall of the INPUT1 input

PASS/FAIL signal (Negative) Æ HIGH

Commands to control the 24-bit I/O port

To output data to each output port (A to H), use the following commands.

To use ports C, D, E, F, G and H as output ports, use the following commands to set ports C

and D as output ports in advance.

• “COUT” on page 283

• “DOUT” on page 307

GPIB command Instrument BASIC command Description

“OUTAIO” on page 369 “WRITEIO 16,0;” Outputs 8-bit width data to port A.

“OUTBIO” on page 369 “WRITEIO 16,1;” Outputs 8-bit width data to port B.

“OUTCIO” on page 370 “WRITEIO 16,2;” Outputs 4-bit width data to port C.

“OUTDIO” on page 370 “WRITEIO 16,3;” Outputs 4-bit width data to port D.

“OUTEIO” on page 371 “WRITEIO 16,4;” Outputs 8-bit width data to port E.

“OUTFIO” on page 371 “WRITEIO 16,5;” Outputs 16-bit width data to port F.

“OUTGIO” on page 372 “WRITEIO 16,6;” Outputs 20-bit width data to port G.

“OUTHIO” on page 372 “WRITEIO 16,7;” Outputs 24-bit width data to port H.

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