Lakeshore 336, User Manual

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6.6.1 Interface Commands 127
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
STB? Status Byte Query
Input

STB?[term]
Returned <bit weighting>[term]
Format nnn
Remarks Acts like a serial poll, but does not reset the register to all zeros. The integer returned
represents the sum of the bit weighting of the status flag bits that are set in the Status
Byte Register. Refer to section 6.2.6 for a list of status flags.

TST? Self-Test Query
Input

TST?[term]
Returned <status>[term]
Format n
<status>
0 = no errors found, 1 = errors found
Remarks The Model 336 reports status based on test done at power up.

WAI Wait-to-Continue Command
Input

WAI[term]
Remarks Causes the IEEE-488 interface to hold off until all pending operations have been com-
pleted. This is the same function as the *OPC command, except that it does not set the
Operation Complete event bit in the Event Status Register.
ALARM Input Alarm Parameter Command
Input
ALARM <input>,<off/on>,<high value>,<low value>,
<deadband>,<latch enable>,
<audible>,<visible> [term]
Format a,n, ±nnnnnn, ±nnnnnn, +nnnnnn,n,n,n
<input>
Specifies which input to configure: A - D (D1–D5 for 3062 option).
<off/on> Determines whether the instrument checks the alarm for this input,
where 0 = off and 1 = on.
<high setpoint> Sets the value the source is checked against to activate the
high alarm.
<low setpoint> Sets the value the source is checked against to activate low alarm.
<deadband>
Sets the value that the source must change outside of an alarm
condition to deactivate an unlatched alarm.
<latch enable> Specifies a latched alarm (remains active after alarm
condition correction)
where 0 = off (no latch) and 1 = on.
<audible> Specifies if the internal speaker will beep when an alarm condition
occurs. Valid entries: 0 = off, 1 = on.
<visible> Specifies if the Alarm LED on the instrument front panel will blink
when an alarm condition occurs.
Valid entries: 0 = off, 1 = on
Remarks Configures the alarm parameters for an input.
Example ALARM A,0[term]—turns off alarm checking for Input A.
ALARM B,1,270.0,0,0,1,1,1[term]—turns on alarm checking for input B, activates
high alarm if kelvin reading is over 270, and latches the alarm when kelvin reading
falls below 270. Alarm condition will cause instrument to beep and the front panel
Alarm LED to blink.