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LabVIEW drivers - Brooks controllers on 0154 control box
It's easy to setup the connection between LabVIEW and your Brooks 0514 control unit. With SmartDDE running and the provided demonstration program it should be easy to create some working program. morechemistry.com shows an example of a setup with 2 pressure controllers and 2 flow meters connected to the control unit.
Communication with a Brooks control unit works like this:
The control unit can be used to set the setpoint. This could result in a discrepancy between the setpoint on the user interface and the actual setpoint. Fortunately it is possible to read the actual setpoint from the control unit.
All these vis have been made with LabVIEW 8.5.1.
The 0154 control unit accommodates four devices. They are named/tagged CHANNEL1 to CHANNEL4.
The 0154 control unit provides only a subset of the information that is available on digital controllers or meters.
If the control unit is not connected to COM1 at 9600 baud, changes must be made to brooks.dde - open.vi. For example CHANNEL1:COM1,RS232,9600 might become CHANNEL1:COM3,RS232,19200.
It should be possible to open the DDE server from a LabVIEW program automatically.
Bart Boshuizen, 2010/04/27