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(b)
Relay hysteresis – ‘rlh’
This command configures the hysteresis setting of the relay. It takes two parameters – the
first if the relay in question, the second is the percentage hysteresis, represented as a
percentage of full scale of the source channel, with limits of 0.0% (i.e. no hysteresis) to
10.0%.
The current hysteresis setting can be retrieved using the query ‘rlh?’. The returned data is
one line for each relay, as follows:
RELAY <x> HYSTERESIS: <hysteresis percentage>%
… where ...
<x> = the relay number
6.8
Other commands
(a)
User input rezero – ‘irz’
To perform a user input rezero function, use this command. Typically the command takes
no parameters to perform the function, although it can take an optional parameter of ‘0’
which clears any value already generated by a previous rezero.
To find the current user rezero value use the query ‘irz?’. The data returned is as follows:
REZERO:
<rezero>
…where…
<rezero> = the current rezero value
(b)
Date of last factory calibration – ‘dlc?’
This query is used to retrieve the date of the last factory calibration run. The data is
returned as follows:
LAST CAL DATE:
<yymmdd>
…where yy = year, mm = month & dd = day.
E.g. 051201 means the last calibration run was 1
st
December 2005.
(c)
Retrieve all settings – ‘ras’
As well as issuing some of the above commands as queries to retrieve individual settings,
this command has been provided which will return a comma separated list of most of the
settings for the input channel, setpoint, etc.
The exact settings provided by this command are detailed in Table 3 in Appendix C.
