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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

最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 Enable