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Computer Interface Commands and Operation
4
4-31
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).]