Service ID shall be set to the Service ID of the service that shall be found. 服务ID应设置为应找到的服务的Service ID
Instance ID shall be set to 0xFFFF, if all Service Instances shall be returned. 如果返回所有服务实例，则实例ID应设置为0xFFFF。
It shall be set to the Instance ID of a specific Service Instance, if just a single Service Instance shall be returned. 如果仅返回一个服务实例，则应将其设置为特定服务实例的Instance ID。
Major Version shall be set to 0xFF, that means that services with any version shall be returned. If set to value different than 0xFF, services with this specific major version shall be returned only. 主要版本应设置为0xFF，这意味着应返回任何版本的服务。如果设置为不同于0xFF的值，则至于具有此特定主版本的服务被返回。
Note注意： It is expected that the Major Version on client side is configured to a specific value in normal operation since the client should look for an specific interface version. Different Major Versions are not compatible to each other. 由于客户端应该查找特定的接口版本，因此期望客户端的主要版本在正常操作中配置为特定值。不同的主要版本互不兼容。
Minor Version shall be set to 0xFFFF FFFF, that means that services with any version shall be returned. If set to a value different to 0xFFFF FFFF, services with this specific minor version shall be returned only. 次要版本应设置为0xFFFF FFFF，这意味着应返回任何版本的服务。如果设置为不同于0xFFFF FFFF的值，则仅返回具有此特定次要版本的服务。
Note注意： It is expected that the Minor Version on client side is configured to 0xFFFF FFFF in normal operation since the client should accept all different Minor Versions. Different Minor Versions shall be compatible to each other. 由于客户端应该接受所有不同的次要版本，所以希望客户端的次要版本在正常操作中配置为0xFFFF FFFF。不同的次版本应该相互兼容。
TTL shall be set according to the configuration. TTL应根据配置进行设置。
If TTL is set to 0xFFFFFF, the SubscribeEventgroup entry shall be considered valid until shutdown (i.e. next reboot). 如果TTL设置为0xFFFFFF，则SubscribeEventgroup条目应被视为有效，直至关闭（即下次重新启动）。
FindServer entries shall never reference Endpoint or Multicast Options. They shall reference configuration options, if configured to do so. FindServer条目不得引用Endpoint或Multicast option。他们应引用configuration options ，如果配置如此。
