Motorola MC17 Guia do Utilizador descarregar pdf (Página 22)

2 - 8 STEP User Guide

Notes on Using Color Bitmaps

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Legacy bitmaps (those used by the PS3050 and earlier terminals) are scaled to fit the native resolution of the

MC17. Thus in order to support both PS3050 resolution bitmaps (128x64) and MC17 TEXT Window

resolution (240x144), a decision on scaling the bitmap is made based on the width of the bitmap. Bitmaps of

128 or less pixels horizontally will be scaled based on the PS3050 native resolution and Larger bitmaps will

be scaled based on the native resolution of the MC17.

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Color bitmaps are much larger than monochrome bitmaps. A native resolution 24 bit color bitmap is in excess

of 100 times larger than the equivalent monochrome PS3050 resolution bitmap. This has a dual impact.

Firstly, the color bitmaps will take longer to download on startup, and secondly, they require more space in

flash memory, So, caution should be taken when using color bitmaps, and use of legacy bitmaps should be

used as much as possible.

Enhancements Which Would Require PSS Changes

Model ID

The MC17 STEP client defaults to reporting a model ID of “3040”, which is a legacy device (PS3040). This is done

to provide legacy compatibility with legacy PSS implementations. The PS3050 uses a “MODELID=nnnn” command

to set the model ID to support enhanced featured in later PSS systems.

Example “MODELID=3050” was used to uniquely identify the PS3050 in those newer system.

The MC17 supports this command for PS3050 legacy compatibility. In addition the MC17 support the

“A4MODELID=xxxx” command to support it’s enhanced features.

Example: “A4MODELID=1770” could be used to identify the MC17.

In this case it is up to the PSS system people to modify their system to support this device. In general this is

required only in mixed system (MC17 and legacy hardware; PS3050, PS3040 etc.), and even then only if you want

to distinguish the MC17 from the other hardware.

For example: In some PSS implementations the PSS system will display keys labels on the bottom line of the

display. This could be removed for the MC17.

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