2640A/2645A NetDAQ

Users Manual

Displaying the Digital I/O Status

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Perform the procedure in Figure 2-14 to display an instrument Digital I/O line status. The instrument updates the DIO display once per second. (See Figure 2-15 for examples.)

Number Of DIO Lines There are eight DIO lines: DIO 0 to DIO 7. You can assign DIO lines as alarm outputs or as digital inputs. For example, a switch closure can toggle a DIO line as an input.

DIO Status Display DIO status display is in the form nnnn-nnnn with five characters in view at a time.

DIO

DIO

Press the DIO (Digital I/O) key to view the Digital I/O status. You can display the Digital I/O status whether the instrument is scanning or not scanning.

Press the left/right arrow keys to display the desired DIO line, DIO7 to DIO0.

A hyphen divides the display, for example, 1111-0000.

Press the DIO key again to exit. NetDAQ Logger for Windows can also display the Digital I/O status.

Figure 2-14. Displaying the Digital I/O Status

Input example Toggling DIO7 between open circuit and ground results in I/O status of 255 (11111111) and 127 (01111111). The changes from 255 to 127 in your scan data provide a direct correlation between the external condition at DIO7 and the analog and computed measurements.

Output example Associating I/O line DIO0 with an alarm results in I/O status of 255 (11111111) when the channel is not in alarm and 254 (11111110) when the channel is in alarm. External equipment such as warning lights can process the logic low output on the Digital I/O connector.

Associating an I/O line with an alarm condition is part of the alarm’s configuration procedure. (See “Alarms” in Chapter 3 of this manual.)

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Fluke 2645A, 2640A user manual Displaying the Digital I/O Status

2645A, 2640A specifications

The Fluke 2640A and 2645A are advanced bench multimeters that represent a significant leap in measurement technology, designed primarily for electrical engineers and technicians who require precision and reliability in their readings. These multimeters are built to cater to complex applications in manufacturing, research, and development.

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