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 Bacnet.ipk package in Sys Config –> System –> Packages

old CPU i.MX28
new CPU i.MX6 POWER

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.