本节介绍通用卡片压花单元（CEU）提供的功能。这些描述包括使用WFSAsyncExecute、WFSExecute、WFSGetInfo和WFSAsyncGetInfo函数可以发出的特定于服务的命令的定义。XFS通常将压纹卡单元视为具有以下功能和特性的复合设备:-磁条卡/智能卡的压花或印刷。-读取/编码磁条磁道1、2和3。-读/写智能卡。-液晶显示器/键盘输入。支持各种压纹卡单元组件的XFS服务概述如下:-磁条卡/智能卡压花或印刷-卡压花单元（CEU）服务。-读取/编码磁条磁道1、2和3-ID卡（IDC）服务，但当执行组合编码/压印时，使用CEU服务类。-读/写智能卡-身份证（IDC）服务，但当执行组合写智能卡/压印时，使用CEU服务类。-液晶显示器/键盘输入-文本终端单元（TTU）服务。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3.30版和3.40版之间对卡片压花单元（CEU）规范设备类所做的更改。

This section describes the functions provided by a generic card embossing unit (CEU). These descriptions include definitions of the service-specific commands that can be issued, using the WFSAsyncExecute, WFSExecute, WFSGetInfo and WFSAsyncGetInfo functions. Embossing card units are generally viewed by XFS as compound devices with the following capabilities and features: - Embossing or printing of magnetic stripe card/ smart card. - Reading/encoding magnetic stripe tracks 1, 2, and 3. - Reading/writing smart card. - LCD display/ keypad input. The XFS services supporting the various embossing card unit components are outlined as follows: - Embossing or printing of magnetic stripe card/ smart card - Card Embossing Unit (CEU) service. - Reading/encoding magnetic stripe tracks 1, 2, and 3 - ID Card (IDC) service, however when combined encoding/ embossing is performed the CEU service class is used. - Reading/writing smart cards - ID Card (IDC) service, however when combined writing smart card/ embossing is performed the CEU service class is used. - LCD display/ keypad input - Text Terminal Unit (TTU) service. XFS 3.40 has been designed to minimize backwards compatibility issues. This document highlights the changes made to the Card Embossing Unit (CEU) Specification device class between version 3.30 and 3.40, by highlighting the additions and deletions to the text.