Using the Computer Interface

4

Computer Interface Command Set

Table 4-8. Command and Query Reference (cont)

DIO_LEVELS?

Digital I/O State Query

DO_LEVEL

ECHO

FORMAT

Returns digital input and output levels for the eight configurable digital I/O lines.

Returns an integer value representing the actual states of the digital I/O lines. The low-order eight bits are used to indicate the status of each configurable I/O line (0 indicates low; 1 indicates high.) Bits 0 through 7 correspond to I/O lines 0 through 7. The highest possible integer value is 255, indicating that all eight digital I/O lines are set high.

NOTE

The digital I/O line levels returned by the DIO_LEVELS? query may not match the levels set with the DO_LEVEL command. Lines that were set to 1 (high) may have been externally driven low. The DIO_LEVELS? query causes the actual state of the lines to be read.

Set Digital Output Level

Set or clear the indicated digital output.

DO_LEVEL <DO_line>,<DO_state> <DO_line> = (0 .. 7) <DO_state> = 1 0

If the digital output line requested is not in the range 0 through 7, an Execution Error is generated. If the DO_state specified is not 1 (high) or

0 (low), an Execution Error is generated. Low is the active alarm state. At power up, all digital outputs are set high.

Enable/Disable RS-232 Echo Mode (RS-232 only)

ECHO <1 0>

1= Turn RS-232 echoing on.

0= Turn RS-232 echoing off.

If the IEEE-488 interface is selected, use of ECHO results in an execution error.

Response Format

Set the output format type.

FORMAT <f_type>

<f_type> =

1 2

The default is 1, which is IEEE-488.2 compatible. Since no measurement units are allowed in IEEE, an alternative (2) is provided. When format 2 is in effect the responses are no longer IEEE-488.2 compatible. The primary use for format 2 is with RS-232, as it provides a means of recording the units with the measurement value. Any parameter other than 1 or 2 causes an Execution Error to be generated. The units strings used are as follows:

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Fluke 2620A, 2625A user manual Diolevels?, Dolevel Echo Format
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2625A, 2620A specifications

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