Fluke 2635A user manual DIOLEVELS? Digital I/O State Query, Dir

Computer Operations 4

Computer Interface Commands and Operation

Table 4-5. Command and Query Reference (cont)

DIO_LEVELS? Digital I/O State Query

Returns an integer between 0 and 255 that summarizes the logical state of the rear panel DIGITAL I/O lines 0 to 7. A logical 0 (low) means the line is asserted. Since the lines can be used as alarm outputs of digital inputs or outputs, the return represents the actual conditions at time of query. There are 256 possibilities, as shown in Appendix E.

	Example: DIO_LEVELS? returns 145 [DIGITAL I/O lines 1, 2, 3, 5 and 6 are asserted
	(logic low).]
DIR	Memory Card Files Directory
	Print a formatted listing of files on the memory card. This includes number of files, bytes
	used, and bytes free. While the directory is printing, all other operations in the
	instrument are suspended. If hardware or software flow control stall this output, the
	instrument waits for the output to be unstalled.
	Example; DIR returns:
	DAT00.HYD 826	07-21-1994		16:20
	DAT01.HYD 1082	07-21-1994		16:50
	SET00.HYD 730	07-21-1994		17:10
	SET01 HYD 730	07-21-1994		18:30
	4 FILE (S)		3368	BYTES
			1030656	BYTES FREE
DO_LEVEL	Set Digital Output Level
	Configures the eight rear panel DIGITAL I/O connector lines, I/O connector lines, I/O 0
	to I/O 7.

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

The rear panel DIGITAL I/O connector has eight lines, 0 to 7. Each line can be assigned to an I/O function. With this command, the line may be set to a logical low (nominal +0.7V DC), or set to a logical high (nominal +5.0V DC). DIGITAL I/O lines are asserted while scanning. When scanning stops, the I/O lines set logic low remain low unless values have been cleared by a new DO_LEVEL command, REVIEW_CLR, or by changing any parameter on any channel. Since I/O lines are shared with the alarm outputs of channels 4 to 20, verify DO_LEVEL commands will not cause ambiguities. (See the ALARM_ASSOC_CLR command to disassociate an alarm with an I/o line.) If this command is entered during scanning while logging to the memory card, an Execution Error is generated.

Example: DO_LEVEL 4, 0 [Set I/o line 4 to a logical 0 (low).]

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