1范围ISO 9041的这一部分规定了（a）在协议机之间面向连接传输数据、控制和参考信息的一组程序，这些协议机实现了基本类虚拟终端服务提供商的功能；（b） 这些程序运行的两种模式；（c） 用于传输数据和控制信息的协议元素的结构，以及这些协议元素到ACSE和较低层服务的映射； （d） 协商协议机器使用的功能单元和服务参数的方法；（e） 用于传输数据和控制信息的协议元素的结构和映射。这些过程定义为（f）虚拟终端协议机之间通过交换虚拟终端协议元素进行的交互；（g） 通过虚拟终端服务原语的交换，虚拟终端协议机和同一系统中的虚拟终端服务用户之间的交互； （h） 通过交换服务原语，虚拟终端协议机与ACSE和表示服务提供商之间的交互。ISO 9041的本部分还规定了实施这些程序的系统的一致性要求（见第13条）。它不包含可用于证明符合性的测试。这些程序适用于在开放系统互连参考模型的应用层中支持基本类虚拟终端服务，并希望在开放系统环境中互连的系统之间的通信实例。

1ScopeThis part of ISO 9041 specifies(a) a set of procedures for the connection-oriented transfer of data, control and reference information between protocol machines which implement the functions of a provider of the Basic Class Virtual Terminal Service;(b) the two modes in which those procedures operate;(c) the structure of protocol elements used for the transfer of data and control information and the mapping of these protocol elements onto ACSE and lower layer services;(d) the means of negotiating the functional units to be used by the protocol machines and the parameters of the service;(e) the structure and mapping of protocol elements used for the transfer of data and control information.The procedures are defined in terms of(f) the interactions between Virtual Terminal Protocol Machines through the exchange of Virtual Terminal protocol elements;(g) the interactions between a Virtual Terminal Protocol Machine and the Virtual Terminal service user in the same system through the exchange of Virtual Terminal service primitives;(h) the interactions between a Virtual Terminal Protocol Machine and the ACSE and Presentation Service providers through the exchange of service primitives.This part of ISO 9041 also specifies conformance requirements (see clause 13) for systems implementing these procedures. It does not contain tests which can be used to demonstrate this conformance.These procedures are applicable to instances of communication between systems that support the Basic Class Virtual Terminal Se rvice in the Application Layer of the Reference Model for Open Systems Interconnection and which wish to interconnect in an open systems environment.