At this point the best way to control relays is by using the EKM-Omnimeter Pulse v.4 connected to your computer running the EKM Dash software: EKM Dash Here is more information about How to Change Meter Settings.
The EKM Dash will allow you to turn either of the 2 relay controls (50mA 12VDC) ON or OFF, it will also let you turn them ON or OFF from 1 to 9999 seconds. You can do this via the USB converter or over the internet via the EKM iSerial.
You can also read the EKM-Omnimeter Pulse v.4 to get the real-time status of each relay control.
At this point we have the EKM Switch120 to control 120 volt loads: EKM-Switch120
The EKM-Omnimeter Pulse v.4 could be used to control any size of load or valve, etc (through external relays).