What does UNK mean?
- Thread starter sohal1025
- Start date
D
Deleted member 143833
"U" is when the AC cannot determine what the timer should be on or off. It is usually harmless and will clear itself. One example...
Assume that the tank is 76.5 F and you have the following 2 lines:
If Temp < 76.0 Then HET ON
If Temp > 77.0 Then HET Off
When you reset the controller (e.g., update program, run, etc). Both statements will be false (because temp is not < 76 and not > 77) so the controller leaves HET as "u". It can be on or off (really) and it doesn't matter. As time passes the temp will rise/lower and one statement will become true. Once a statement is true the device on/off will be known and the "U" will go away.
Make sense?
Assume that the tank is 76.5 F and you have the following 2 lines:
If Temp < 76.0 Then HET ON
If Temp > 77.0 Then HET Off
When you reset the controller (e.g., update program, run, etc). Both statements will be false (because temp is not < 76 and not > 77) so the controller leaves HET as "u". It can be on or off (really) and it doesn't matter. As time passes the temp will rise/lower and one statement will become true. Once a statement is true the device on/off will be known and the "U" will go away.
Make sense?
d0ughb0y
Active member
nobody likes unknown state, and I can't say its a good thing.
I think there is room for neptune to improve the firmware by allowing a default state, so a device can always start in a known state. OSC and RND commands already have that,
OSC 001/005 ON/OFF PH1 ON
where the ON at the end is the initial state. I think adding the option to specify the initial state will be a nice improvement.
I think there is room for neptune to improve the firmware by allowing a default state, so a device can always start in a known state. OSC and RND commands already have that,
OSC 001/005 ON/OFF PH1 ON
where the ON at the end is the initial state. I think adding the option to specify the initial state will be a nice improvement.
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