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ECM1240 Log Gathering
ECM 1240 only has one device by your breaker panel
Data is sent to a receiving PC or any device that can receive serial data and log it (wireless router with usb to serial port adapter, or even arduino with SD card if needed).
Communication is over serial port (3 wires needed, more than one ECM can share the same cable), wireless serial via Zigbee, or ethernet to serial adapters.
If at all possible, running a cat-5 cable and putting DB-9s on each side is the most reliable and cheapest.