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11. Technical Reference
This section contains technical reference topics not covered elsewhere:
Optimizing Playback Performance
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RS-232 Technical Reference
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Backup Contents
– Understanding which files and folders the iCC saves in a backup.
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11.1 Optimizing Playback Performance
You can optimize the playback performance of specific media by taking note of these points:
The player units have no problem displaying MPEG-2 video at a reasonable rate (up to 10 Mbps). This typically uses less
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than half of the player processing power.
You should resize images (especially digital photos) before uploading them onto the iCC. Ideally, resize them so that they
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match the size of the zone.
Scrolling text uses relatively little processing power, provided it does not take up more than 30% of the screen area.
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Animations (typically in Flash or HTML with embedded JavaScript) have no upper limit to the processing power they require
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and can overwhelm the player. If this occurs, the animation will typically run slowly but other zones will continue as normal.
11.2 RS-232 Technical Reference
The pin assignment of the RS-232 9-way D-PLUG is as follows:
Pin
Direction
1
Input to iCC
2
Input to iCC
3
Output from iCC
4
Output from iCC
5
6
Input to iCC
7
Output from iCC
8
Input to iCC
9
Input to iCC
For historical reasons, the RS-232 standard uses a variety of terminology to describe its signal status:
Lowered = Negated = Logic 1 = -ve voltage = Off = Marking.
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Raised = Asserted = Logic 0 = +ve voltage = On = Spacing.
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The iCC uses voltage level in order to describe line status since this is the only explicit identification.
– Enhancing the playback performance of specific media types.
– Understanding RS-232 pin assignments and electrical interfaces.
RS-232 Name
Quiescent State
DCD
High impedance
RxD
High impedance
TxD
-ve voltage level
DTR
-ve voltage level
Sig. GND
DSR
High impedance
RTS
-ve voltage level
CTS
High impedance
RI
High impedance
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