The Satel Integra Alarm System allows openHAB to connect to your alarm system via TCP/IP network with ETHM-1/ETHM-1 Plus module installed, or via RS-232 serial port with INT-RS/INT-RS Plus module installed. For ETHM-1 the binding uses integration protocol, so it must be enabled and properly configured.
Also it is always a good idea to update module/mainboard firmware to the latest version. For ETHM-1 and INT-RS modules it is a must. For "Plus" modules however it is not required.
In order to use encryption with ETHM-1/ETHM-1 Plus, Java Runtime Environment must support 192 bit AES keys. Oracle Java by default supports only 128 bit keys, therefore "Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files" must be installed. OpenJDK supports unlimited AES keys by default (but OpenJDK is sometimes discouraged for openHAB).
More details and all documentation about Integra system you can find on their site: satel.pl