# 1. General Information

Most Alarm Control Panels informs Monitoring Station about specified events by sending CONTACT ID protocol messages. It helps easily and quickly identify where and which alarm event occured. ET08 device is used to work with Alarm Control Panel and transmit CONTACT ID protocol messages via GSM audio channel to Monitoring Station or/and decoding it to user-understandable text which will be sent to users by SMS messages. Using software ELDES Configuration Tool user can specify how to decode these CONTACT ID protocol messages to user-understandable text, i.e. enter text which will be received by SMS message when specified event occurs. Read more about setting ET08 parameters in section 2. More about CONTACT ID protocol messages composition and standart event codes You can find in section 3.