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3.6
Keyboard controller
3.6.1
Scanning the front panel keys
Transferring the key codes (MF2) to the PC
Transferring the key codes to the 24 VOut-outputs
1070 073 826-101 (01.10) GB
For many industrial applications it is important to determine the key status
(pressed/not pressed, key LED ON/OFF) of the front panel keyboard.
For this, a keyboard controller or an external keyboard scans the front panel
keys and transfers the key codes, switch positions etc. to various interfaces.
The current status of the front panel keys is passed on
D to the PC via MF2
D to the 24VOut output
The codes can be processed further by the application program via 24VOut.
The MF2 codes are available in the standard design in the first input byte and
are passed on from the controller to the PC (refer to the assignment table on
page 3–6).
.
Bit 1 corresponds to the low-order bit.
Pressed navigation keys are bit coded and immediately applied by the con-
troller to the output 24 VOut.
D Bit1: CRTL-L
D Bit2: CRTL-R
D Bit3: CRTL-U, CRTL-D (corresponds to S09 or S11 or
Left handle bar
S09
S10
S11
Navigation keys
In this regard, also refer to the "code assignment table on page 3–6".
Display and operating elements
(corresponds to S10)
(corresponds to S13)
S12 or S14)
Right handle bar
3–5
S12
S13
S14
Navigation keys
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