Instructions

UM-0085-B09 DT80 Range User Manual Page 260
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Part M – Configuration
Configuring the DT80
Parameters
DT80 parameters are internal system settings. They are global in their effect, and allow a variety of options to be set. As
a general rule, set the parameters that require changing before programming schedules and alarms.
Parameters are numbered from P0 to P62, although not all numbers are used. Each parameter is an integer; the range
of allowable values varies from parameter to parameter.
Reading Parameters
To read the current setting of a parameter, simply send the parameter’s ID. For example, to read the value of P11:
P11
50
Setting Parameters
Parameters can be set at any time, and new settings generally take effect immediately. For example, send:
P11=60
to set parameter P11's value to 60.
Note: Parameters are not channels. The statement P11=60 is a command, and is carried out immediately, even if it appears within a
schedule definition. You can use the
DO command to set parameters when a schedule executes – see Executing Commands in
Scheduless (P59) for more information.
Parameter Lifetime
All parameter settings are cleared back to their default values when a soft or hard reset (INIT or HRESET) is
performed, or if both external and battery power is lost.
To make a parameter setting "permanent", it should be set using the matching profile setting (see Profile Settings
(P264)), e.g.
PROFILE PARAMETERS P11=60
When a parameter is set in the profile, it effectively becomes the new default value. You can still override it temporarily
using the
Pnn=xx command, but it will revert to the profile value if a soft or hard reset occurs.
To reset a parameter to its factory default value you can use
•
PROFILE PARAMETERS P11= to reset a single parameter
•
PROFILE PARAMETERS= to reset all parameters
• FACTORYDEFAULTS to reset all settings, including parameters, switches and profile settings
The DT80 recognises the following parameters:
Parameter Specifies Units
Default
Value
Range of
Values
Comment
P0
Max analog input drift before
re-calibration
µV
3
0 to
10000
Voltage measurements may "drift" as the ambient
temperature changes. If the drift is greater than this
amount the DT80 will automatically re-calibrate itself to
restore accuracy.
P3
Minimum sleep period ms
1500
1 to
30000
The DT80 will only go to sleep if the sleep duration can
be for at least this period of time
P4
Sleep-to-wake latency ms
800
1 to
30000
Time required by DT80 to resume normal operation after
leaving sleep mode
P8
Command processor diagnostic
mode
mode
0
0 to 1
If this parameter is set to 1 then each and every
command string will be displayed before being executed.
This can be useful for verifying that alarm actions are
being carried out, as these commands are not normally
echoed.
P9
Logging of alarm state mode
1
0 to 3
0 = do not log alarms
1 = log false to true transitions only
2 = log true to false transitions only
3 = log both transitions