Command Messages Cha
ter Nine: RS-232 Communications
280
How To Check the Status of an Alarm or a Relay
There are separate read only messages to report the status of an alarm and the status of a relay.
The status message reports whether the alarm or relay is enabled, disabled, or tripped.
To determine the status of an alarm or a relay, send the message:
@60#X?<CR>
where # = is A for a relay or B for an alarm
where X = is the alarm letter (A, B, C, or D)
The 146 responds with:
@60#X:S <CR>
where S = is relay or alarm state: E = Enabled; D = Disabled; T = Tripped
How To Determine the Leak Rate
The 146 instrument can calculate the leak rate of a sensor. The leak rate reflects the amount of
leakage over a user-defined time period, expressed as pressure units per second. For example, if
the pressure is measured in Torr and you have selected a time base of 30 seconds, the leak rate
will be reported as Torr per 30 seconds. The leak rate period entry is global and applies to all
channels.
The leak rate is calculated as a moving average using the most recent measurements. The 146
instrument continually replaces the oldest value with the latest value and recalculates the new
leak rate. Initially, when you enter the leak rate period, you must wait until the time period has
elapsed before querying the 146 instrument to report the leak rate.
The range is from 1 to 60 seconds; the default value is 1.
To determine the leak rate, you must first specify the time period, for example, 30 seconds:
@507
•
:30 <CR>
where
•
= represents a blank space
To request the leak rate on channel 5, enter:
@6065? <CR>
Following the example above, the 146 instrument responds with:
@6065:2
<
CR
>
This response indicates that a 2 Torr difference in pressure has occurred over 30 seconds.
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