Secure Meters Ltd. Offers ECD 100 Modem. Secure Meters Ltd. Is an ISO: 27001 and ISO: 14000 certified company. ECD 100 Modem is used for data transfer between an electronic energy meter and remote/ central station over GSM communication network. ECD 100 Modem, in conjunction with base computer software [BCS], offers a cost effective solution for remote automatic meter reading. It provides a GSM based transparent communication channel for reading digital energy meters.