How to Remotely Control AC Power for a WEB Server Using an Acromag ES2113 or a 989EN-4C16 Ethernet Digital I/O Module Application Note
This document outlines the steps taken to use an ES2113 or 989EN DIO to control a latching relay that is used to open or close the AC power (115 VAC) path used by a multi domain WEB server. In this mode of control the DIO is configured to a static IP address and is therefore accessible from anywhere on the Internet. The web server described in this outline has been setup to automatically boot up at power on. The ES2113 might be viewed as major overkill for this project, however with a little ingenuity the user could easily increase the number of relays and use the same circuitry to control house lighting both inside and out as well as putting some of the ports to use to return digital environmental data monitored at the server site all while on vacation.
In the application note diagram, you’ll see that the user has made use of two ports when using the ES2113. Port 1 is being used to control the Set and Reset coils in the latching relay and Port 2 is being used for reading back the telemetry contacts in the latching relay. If a 989EN DIO is used the same functionality can be accomplished using a single 16 bit port in which case the telemetry would be monitored on bits 14 and 15 of the port and the user would mask for these two bits to read telemetry from the single 16 bit port.
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