LogicMachine as BACnet client

Example: Use LogicMachine as BACnet client

Task

How to read BACnet client data and send this information into KNX bus.

 

Install latest firmware available here

 

Install the genohm-scada-bacnet.ipk from Extra packages in: Sys Config –> System –> Packages

Note

Before using any bacnet function, you must include the library:

 require('bacnet')

 

Examples of commands

• Read current value of binary or analog object:

  bacnet.readvalue(device_id, object_type, object_id)

• Read binary object:

  value = bacnet.readvalue(127001, 'binary value', 2305)

• Read analog object:

  value = bacnet.readvalue(127001, 'analog value', 2306)

• Write new value to binary or analog object priority array:

  bacnet.write = function(device_id, object_type, object_id, value, priority)

  Value can be nil, boolean, number or a numeric string
  Priority parameter is optional, lowest priority is used by default

• Set binary object value:

  bacnet.write(127001, 'binary value', 2305, true)

• Set analog object value:

  bacnet.write(127001, 'analog value', 2306, 22.5)

• Set binary object value at priority 12:

  bacnet.write(127001, 'binary value', 2305, true, 12)

• Set analog object value at priority 10:

  bacnet.write(127001, 'analog value', 2306, 22.5, 10)

• Clear binary object value at priority 12:

  bacnet.write(127001, 'binary value', 2305, nil, 12)

 

Multi-input/output

Create object for operation mode, set data type to 1-byte unsigned integer. Create event script for this object:

require('bacnet')

-- set new operation mode
value = event.getvalue()
bacnet.write(3, 'multi-state output', 10105, value)

• Example: read current value of error code

  value = bacnet.read(3, 'multi-state input', 10104, 'present value')

• Example: read current value of operation mode

  value = bacnet.read(3, 'multi-state input', 10106, 'present value')

• Example: set new operation mode, set to cooling (1)

  value = 1
  bacnet.write(3, 'multi-state output', 10105, value)

• To read/write other objects, refer to the scan table in BACnet tab.
• Read/write function have the same first 3 parameters:1. Device ID: you should not change it if you only have one device
  (Device nr. 3)
  2. Object type: ‘binary output’, ‘analog input’, ‘multi-state value’, etc
  3. Object ID: use values from scan tableNote: inputs can only be read. Values and outputs can be read and written.