Jetter JVM-407B-HMI, User Manual

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200 Jetter AG
10 Programming
Digipot
The JVM-407B has a digipot with pushbutton feature, which offers a
convenient input option. The following provides details of the digipot's special
registers with a corresponding sample program.
The following special registers exist for the digipot:
Register Description
363000 This register holds the current count value. If you turn the digipot, the
count value increments or decrements. The following rule applies:

Turning the digipot clockwise = incrementing the register

Turning the digipot counter-clockwise
= decrementing the register
363001 Bit 0: 0 = Pusbutton not pressed
Bit 0: 1 = Pusbutton pressed
363002 This register lets you specify the lower limit for the digipot reading. If you
continue turning the digipot counter-clockwise, register 363000 remains at
this minimum value.
363003 This register lets you specify the upper limit for the digipot reading. If you
continue turning the digipot clockwise, register 363000 remains at this
maximum value.
The sample program has been tested for compliance with the following
software versions:

JetSym version 5.1
 HMI JVM-407B, OS version 4.01
For more information on programming by STX, please turn to the online help
in JetSym.
In the following sample program, the background lighting for the JVM-407B is
dimmed using the digipot. An upper and lower limit for the digipot is specified
for this purpose. If you press the pushbutton, full background lighting is
activated.
Var
Digipot_Count : Int A t %VL 363000 ;
Digipot_Limit_min: Int At %VL 363002 ;
Digipot_Limit_max: Int At %VL 363003 ;
Digipot_Button : Int At %VL 363001 ;
BackgroundLighting: Int At %VL 364000 ;
End_Var ;
Task Main Autorun
Digipot_Count := 0 ;
Digipot_Limit_max := 17 ;
Digipot_Limit_min := 0 ;
Introduction
Digipot registers
Software versions
JetSym STX program