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Transas Dedicated Keyboards
Transas ES4 Dedicated Keyboard
Functional Description
The Trackball-Keyboard consists of two keyboard fields (“QUERTY”, function
and DIM-keys) and a separate Trackball:
1. Keyboard.
All key are backlit with yellow LEDs (Light Emitting Diodes). The QUERTY-field
is printed with a “hiding-effect”, i.e. the key legends are normally invisible when
not lit. The QUERTY-field normally is not lit. When a key is pressed the backlight
is switched on and the first key press is not sent to the PC. When the light is
dimmed down to the lowest level, the QUERTY-field will be lit with full brightness
(daylight operation). Above this level the brightness of both fields are equal.
When no key of the QUERTY-field is pressed for more than 30 seconds
the backlight of will be switched off. With the keys “Dimmer +” and “Dimmer -”
the brightness can be adjusted in 255 steps.
The keyboard has a standard PS/2 Interface to the PC. On the back of the keyboard
is a PS/2-plug, which accepts a standard PS/2 compatible keyboard. Key codes
from this keyboard will be forwarded transparently to the PC.
The QUERTY-field produces standard key codes according to the imprinted legend.
The coding is for an US-keyboard. Some key have a second code imprinted on their
upper half. This is sent when the key is pressed together with the FN-key.
The Function-have the following coding:
Legend
A
B
C
Ahead
Alarm
Zoom In
N/H/C Up
Fig. 90. View of PCI 4xRS232 Sunix 4456A card
Key-Code
<Alt> + <G>
<Alt> + <K>
<Alt> + <T>
<F8>
<Ctrl> + <A>
<+> (from Num-block)
<Alt> + <H>
Annex F. RS4v2 Computer Based Hardware
Technical Specification
331
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