VB开发BACnetIP主站介绍
时间:2013-08-06 阅读:1155
VB开发BACnetIP主站介绍 |
Visual Basic开发BACnet IP主站程序方法介绍 这里要说的方法就是调用BACnet IP主站快速开发工具OMBACnetIPMaster.dll。 步骤1、创建通道,而通道管理所有的Bacnet属性对象。参数分别IP地址,端口号和网络超时时间,默认是100毫秒。 Private Sub OpenChannelButton_Click() StringToByte txtIPAddress, IPAddress() ChannelHandle(0) = CreateBacnetChannel(IPAddress(0), CLng(txtPort), 100) End Sub 通道编辑操作的相关API函数声明如下 ‘ 通道管理用于创建、修改、删除通道。创建通道以后,才能创建Bacnet属性对象 ‘ 创建一个通道对象只要是为了设置不同设备的IP地址和端口号。网络超时等待时间默认是100毫秒 Function CreateBacnetChannel Lib 'OMBacnetIPMaster.dll' Alias '_CreateChannel@12' (ByRef IPAddress As Byte, ByVal nPort As Long, ByVal nTimeOut As Long) As Long Function ConfigureChannel Lib 'OMBacnetIPMaster.dll' Alias '_ConfigureChannel@16' (ByVal ChannelHandle As Long, ByRef IPAddress As Byte, ByVal nPort As Long, ByVal nTimeOut As Long) As Long Function RemoveChannel Lib 'OMBacnetIPMaster.dll' Alias '_RemoveChannel@4' (ByVal ChannelHandle As Long) As Long 步骤2、创建Bacnet属性对象。 Private Sub CreateBacnetObjButton_Click() TagHandle(0) = CreateBacnetObj(ChannelHandle(0), 1, 1, 85) End Sub BACnet属性对象编辑相关的API函数申明如下 ‘ BACnet对象管理,创建、修改、删除 ‘参数 ChannelHandle 为通道对象的句柄 ‘参数 nBacnetObjType 为Bacent属性对象的类型ID,譬如0表示 Analog Input,1表示Analog Output ‘参数 nInstanceNum 为指明哪一个对象,譬如要访问Analog Input 1。则 nInstanceNum为1 ‘参数 nProperityID 为要访问属性的ID,譬如当前值的属性ID是85 ‘参数 TagHandle 为Bacnet对象的句柄 Function CreateBacnetObj Lib 'OMBacnetIPMaster.dll' Alias '_CreateBacnetObject@16' (ByVal ChannelHandle As Long, ByVal nBacnetObjType As Long, ByVal nInstanceNum As Long, ByVal nProperityID As Long) As Long Function ConfigureObject Lib 'OMBacnetIPMaster.dll' Alias '_ConfigureObject@16' (ByVal ChannelHandle As Long, ByVal nBacnetObjType As Long, ByVal nInstanceNum As Long, ByVal nProperityID As Long) As Long Function RemoveBacnetObject Lib 'OMBacnetIPMaster.dll' Alias '_RemoveBacnetObject@4' (ByVal TagHandle As Long) As Long 步骤3、BACnet属性对象的读写 Private Sub WriteBacnetObjectButtton_Click() error = WriteBacnetObj(TagHandle(0), CSng(Tag2.Text), 0) End Sub Private Sub ReadBacnetObjButton_Click() Dim a As Variant error = ReadBacnetObj(TagHandle(0), a) Tag1.Text = a End Sub ‘ BACnet对象属性值读写 ‘参数 nTagNum 为Bacnet对象的Tag Number。也就是要写的对象属性的数据类型。当操作过ReadBacnet以后,这个参数可以为空。 ‘当只写操作的时候,则需要用户自己指明是什么数据类型。譬如Analog Output为4.也就是单精度浮点型。 Function ReadBacnetObj Lib 'OMBacnetIPMaster.dll' Alias '_ReadBacnetObject@8' (ByVal TagHandle As Long, ByRef Value As Variant) As Long Function WriteBacnetObj Lib 'OMBacnetIPMaster.dll' Alias '_WriteBacnetObject@12' (ByVal TagHandle As Long, ByRef Value As Variant, ByVal nTagNum As Long) As Long 步骤4、关闭程序时,释放对象资源。 Private Sub RemoveBacnetObjButton_Click() error = RemoveBacnetObject(ByVal TagHandle(0)) End Sub Private Sub RemoveChannelButton_Click() error = RemoveChannel(ByVal ChannelHandle(0)) End Sub zui后讨论一下辅助函数的作用 ‘以下是辅助函数,可以选择性使用 ‘设置写操作的优先等级 Function SetBacnetPriority Lib 'OMBacnetIPMaster.dll' Alias '_SetBacnetPriority@8' (ByVal TagHandle As Long, ByVal nPriority As Long) As Long ‘返回Bacnet对象属性的数据类型,一般用于写操作 Function GetBacnetObjType Lib 'OMBacnetIPMaster.dll' Alias '_GetBacnetObjType@4' (ByVal TagHandle As Long) As Long ‘通信故障状况回调函数 Function EnableErrorMsgNofity Lib 'OMBacnetIPMaster.dll' Alias '_EnableErrorMsgNofity@4' (ByVal Callback As Long) As Long Function EnableAbortMsgNofity Lib 'OMBacnetIPMaster.dll' Alias '_EnableAbortMsgNofity@4' (ByVal Callback As Long) As Long Function EnableRejectMsgNofity Lib 'OMBacnetIPMaster.dll' Alias '_EnableRejectMsgNofity@4' (ByVal Callback As Long) As Long |