I had picked up a Baytech MP power strip recently, and wanted to monitor it with MRTG.
For $1, I got a Cisco DE9-RJ45 cable (blue). Because I’m lazy, I just cut it halfway and connected the relevant wires.
|RJ45 side||DE-9 side||Actual DE-9 pin||Signal|
|4||3||2||TXD (Device to Host)|
|5||6||3||RXD (Host to Device)|
Connection seems to be 9600 Baud, N-8-1.
I got a command prompt, and you can enter “status” to view the current data, with output like this:
Average Power: 107 Watts
True RMS Voltage: 120.7 Volts
True RMS Current: 1.2 Amps
Maximum Detected: 2.1 Amps
This can be easily retrieved and split for logging with MRTG or any other app.