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Control Driver Example

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Appendix

Control Driver Example

This example shows how to control a Panamax MAX 5410 Pro AC power source via

its RS-232 interface. The driver will create six control subNodes which will represent

six buttons, each having a distinct function. These buttons can then be displayed on the

DigiLinX GUI. The subNodes will represent the following functions:

subNode Function Description

1 Power On Initiates power-on sequence

2 Power Off Initiates power-off sequence

3 Switched Cycles power to the switched outlets

4 High Current Cycles power to the high current outlets

5 All Off Turns off all outlets

6 Cycle Initiates a power-cycle sequence

The example uses a user created function, createButton, to encapsulate the repetitive

tasks for creating each of the button subNodes. Each subNode will have four

variables, Name, the name of the subNode used for addressing, xmit, the RS-232

string to transmit when the button is pressed, Label, the text that will appear on the

GUI button face, and indicatorState, which will determine whether or not the indicator

LED on the GUI button will be on or off. Each subNode will also contain one

function, handle_button, which is called whenever the corresponding GUI button is

pressed.

Because of the way Lua parses the source files, the functions that the example uses

must be defined before they are actually used, so that is why the functions will appear

first.

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Clearone Writing StreamNet User Manual Page 47