本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下的卡片分发器（CRD）设备类提供的服务的功能。卡片分发器用于将一张卡片从一个或多个箱子分发给消费者。大多数发卡机构也有能力保留一张卡到一个箱子。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3.30版和3.40版之间对CRD设备类所做的更改。

This specification describes the functionality of the services provided by the Card Dispenser (CRD) device class under XFS, by defining the service-specific commands that can be issued, using the WFSGetInfo, WFSAsyncGetInfo, WFSExecute and WFSAsyncExecute functions. A Card Dispenser is used to dispense a single card to a consumer from one or more bins. Most card dispensers also have the ability to retain a card to a bin. XFS 3.40 has been designed to minimize backwards compatibility issues. This document highlights the changes made to the CRD device class between version 3.30 and 3.40, by highlighting the additions and deletions to the text.