此规范通过定义可以使用WFSGetInfo、WFSAsyncGetInfo、WFSExecute和WFSAsyncExecute函数发出的特定于服务的命令，描述了XFS下由Alarms（ALM）提供的服务的功能。本节介绍适用于有人值守和无人值守（自助服务）设备的报警（ALM）服务的功能。当与有人参与的CDM或无人参与（自助服务）设备相关联的一个或多个逻辑服务被锁定时，由于需要设置或重置警报，因此报警设备类作为单独的服务提供。由于应用程序可以锁定逻辑服务，因此警报在单独的设备类中实现，以确保可以随时执行设置（触发器）或重置操作。XFS3.40被设计为最小化向后兼容性问题。本文档通过突出显示文本的添加和删除，突出显示了在版本3.30和3.40之间对报警（ALM）规范设备类所做的更改。

This specification describes the functionality of the services provided by Alarms (ALM) under XFS, by defining the service-specific commands that can be issued, using the WFSGetInfo, WFSAsyncGetInfo, WFSExecute and WFSAsyncExecute functions. This section describes the functionality of an Alarm (ALM) service that applies to both attended and unattended (self-service) devices. The Alarm device class is provided as a separate service due to the need to set or reset an Alarm when one or more logical services associated with an attended CDM or unattended (self-service) device are locked. Because logical services can be locked by the application the Alarm is implemented in a separate device class to ensure that a set (trigger) or reset operation can be performed at any time. XFS 3.40 has been designed to minimize backwards compatibility issues. This document highlights the changes made to the Alarm (ALM) Specification device class between version 3.30 and 3.40, by highlighting the additions and deletions to the text.