Digital
Communications
Figure 19. Sample Communications Commands
. Requesting a Parameter from a Controller
Caution:
Wherever
possible,
avoid
using the “Enter”
command and use
“Modify” or “Read”
instead. The “Enter”
command makes
permanent changes
to the NOVRAM in
the Series 16’s
microprocessor, and
after accepting a
maximum capacity of
100,000 “Enter”
statements, it will
have to be returned
to the factory and
replaced.
Communications
Notes
1. The controller will respond with <LF>ERROR<CR><LF> for messages containing invalid/incorrect
commands, parameter number or data (with decimal, if needed).
2. Process Value is a read-only parameter; therefore, a modify or enter command for Process Value will
result in a <LF>ERROR<CR><LF> response.
3. For modify or enter command: if the new value is out of the parameter’s range, the controller will default
to the highest or lowest allowable parameter value.
4. Parameters with decimal data must contain a decimal character in the data portion of the message.
5. Ramp “on” command (Setpoint Target Time) will not be executed if ramp time is set to zero or absolute
deviation between Setpoint and Process Value is less than or greater than 5 temperature or process units.
6. Autotune, manual and ramp commands are mutually exclusive, i.e., selecting manual while autotune is
enabled will abort the autotune mode.
7. If the controller is in Standby mode, selecting autotune, manual or ramp will de-select Standby.
8. Setpoint should not be modified while the controller is in autotune or ramp mode.
9. The Setpoint Value enter command should not be executed while the controller is in manual mode.
This section is solely
intended as a very
basic overview.
Please refer to the
Athena
Communications
Manual for more
detailed information.
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