Encoder receiver transmitter (ERT) is a packet radio protocol developed by Itron for automatic meter reading.
[3] ERT is an OOK modulated radio signal which is transmitted in the unlicensed 900-920 MHz band.
The protocol uses frequency-hopping, a multiple access method to avoid interference with other nearby meters.
It should be possible to decode ERT signals using general purpose UHF packet radios such as the Texas Instruments CC1101 or Freescale MC33696.
A software-defined radio receiver has been implemented using inexpensive hardware: RTLAMR, and the rtl_433 software will decode SCM messages.