This message can be used to login to an ACS server program. The ACS should respond with the Login Response message. Whether to use this message or to use some other mechanism to login to the ACS is configurable on the SC. When this message is used, it will be the first message sent to the ACS.
The 3M SelfCheck system sends this command when it is coming on-line, going off-line or when the 3M SelfCheck system printer is out of paper. It also indicates the SIP version supported by this SC system. This message is sent from the 3M SelfCheck system on startup. If the Login message is being used, this message follows the Login message. The ACS must respond with a SC Status Response. See scenarios 1 and 2.