181-122018_THCD-101 Instruction Manual
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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 December 1, 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 the table below.
Description
Type and size
Input channel units string
5 char string
range
8 char string representation of a float
full scale
8 char string representation of a float
Setpoint value
8 char string representation of a float
slave value
8 char string representation of a float
mode
1 byte (0-2 as for spm? query)
source
1 byte (0-1 as for sps? query)
initial value
8 char string representation of a float
initial slave value
8 char string representation of a float
initial mode
1 byte (0-2 as for sim? query)
Adaptive filter band
4 char string representation of a float
size
1 byte (0-6 as for fls? query)
Relay 1 trip point
8 char string representation of a float
hysteresis value
4 char string representation of a float
Relay 2 trip point
8 char string representation of a float
hysteresis value
4 char string representation of a float
Last factory calibration date
6 char string (format as for dlc? query)
4.2.1. Command Set Summary
Purpose
Cmd Query
Parameters
Notes
