This article explains that all ECM Computer Modules (ECM, ECMG2, ECMG2B, ECMG2C, AECMG2, AECMG2C, ECMG3, ECMG4) require connection to an IDS Monitor to operate

You cannot operate them separate from the monitors as they require power from the monitor to operate. There are no workarounds for this. 

For computers that can operate separate from the monitor, see below:

• EloPOS Pack with Windows
• Elo BackPack with Android Open Source
• Elo BackPack with Android and Google Play Services