APEX Classic* APEX Lite** APEX JR Display Yes Yes Yes Max # Modules 29 29 7 Temp Probe ready Yes Yes Yes pH Probe ready Yes Yes No pH/ORP Probe ready Yes No No 4-variable ports Yes No No Connect Breakout Box Yes Yes No Connect Legacy Modules Yes Yes No Amperage reporting Yes Yes No Fallback Mode Yes Yes Yes Audio alarms Yes Yes Yes # Outlets in Standard Package 8 8 4
Max # Modules – Maximum number of Aquabus modules you can connect in the Aquabus chain. An APEX Jr running older firmware has a limit of 4 expansion modules; with APEX firmware 4.40 (released August 2015) and newer firmware versions, that limit is now 7 modules. The display does not count as a module.
Temp Probe Ready – Has the temperature probe jack on the base module. The PM1, PM2, PM3, and ASM modules also have temperature probe jacks as does the PX1000 legacy module.
pH Probe Ready – Has the BNC style pH probe jack on the base module. The PM1 module also has a pH probe jack.
pH/ORP Probe Ready – Has the BNC style combo jack on the base module that can support either a second pH probe or an ORP probe based on how you configure it. The PM1 also has a selectable pH/ORP probe jack.
4-variable ports – Has 4 variable voltage ports that can be used either for variable speed pumps like Tunze or for controlling DIY dimmable lighting. You can also get 4 variable 0-10v outpus with the VDM module.
Connect Breakout Box – Has a miniDIN-8 jack for connecting a Breakout Box. The BoB is used to connect float switches or any other NO/NC style contact switch. The PM1, PM2, PM2 Aquabus modules have the miniDIN-8 jack as well.
Connect Legacy Modules – Has a RJ11 style jack for connecting legacy modules (i.e. modules from the pre-APEX generation of products line like the DC8, DC4HD, AquaSurf, LunarSim, etc.)
Amperage Reporting – Can report/display the total amperage load for the EB8/4 modules (not per outlet). Since the Jr. is neither an EB8 or an EB4, it does not have this capability. If you add an EB8/4 to the Jr. then that additional EB module would have amperage reporting but not the base Jr. module itself.
Fallback Mode – This defines for EB8 and EB4 modules whether the outlet should retain power in the event it loses communications with the base module. For more information see the Fallback and Set statements in the Reference Manual.
Audio Alarms – Can define alarm or warning conditions that activate a choice of alarm sounds. Speaker is in the display so the display module is required for this. Very important when an email might not be noticed like in the middle of the night and your power fails.
# Outlets in Standard Package – Number of controllable 110VAC outlets on the base module or delivered as part of a standard Neptune package. Can purchase extra outlet modules like the EB4 and EB8.
*The APEX Gold was not a separate controller model. The APEX Gold was an advanced package which includes everything in the APEX Classic standard package plus lab-grade pH, ORP, & conductivity/salinity probes and a PM2 module for connection of the conductivity probe.
** The APEX Lite has been discontinued. However, since the APEX, APEX Lite, and APEX JR all use the same software, new features introduced in firmware, all existing and new expansion modules, accessories, etc, will continue to work with the APEX Lite.
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