You cannot connect one DOS to another DOS using a 1Link cable. See my Apex Hardware Overview article for a complete list of device power consumption under the 1Link section. The DOS draws 22 watts, so be sure the other 1Link-connected modules and 24VDC devices you connect to the same source do not push it over the 100 watt limit. Both the 1Link and EBx32 modules have a 100 watt load limit for 1Link and 24VDC Accessory connections. The 1Link cable must connect the DOS directly to a 1Link module, or to a 1Link port on the EB832 or EB632 EnergyBar. When connecting through a 1Link cable, it provides both the communications channel and 24v to operate the motors. and Apex Classic to the current Apex 2016 and Apex-EL. The DOS is compatible with all models of the Apex base unit, from the old Apex Jr. The DOS can lift liquids up to 24 feet vertically, and pump nearly unlimited distances horizontally, making the placement of the DOS very flexible for people with aquariums at a distance from an equipment room or basement. The DOS pump heads are a user-replaceable peristaltic pump that prevent any siphon action since the internal tubing is pinched closed in at least one position at all times both when running and when at rest. Each DOS head (or pump) can be individually operated and programmed, and can run at 6 different speeds in a forward or reverse direction. It may be used to dose additives into your aquarium or can be used for automatic water changes. The DOS is Neptune's two-head dosing pump for the Apex system. This article is a part of my whole series of Apex tutorials, available here:
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