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11.2 Optimizing Playback Performance
You can optimize the playback performance of specific media by taking note of these points:
iCOMPEL players have no problem displaying MPEG-2 video at a reasonable rate (up to 10 Mbps). This typically uses
less than half of the iCOMPEL processing power.
You should resize images (especially digital photos) before uploading them onto the iCOMPEL. Ideally, resize them so
that they 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.
Animations (typically in Flash or HTML with embedded JavaScript) have no upper limit to the processing power they
require and can overwhelm the iCOMPEL. If this occurs, the animation will typically run slowly but other zones will
continue as normal.
11.3 RS-232 Technical Reference
The pin assignment of the RS-232 9-way D-PLUG is as follows:
Pin
Direction
1
Input to iCOMPEL
2
Input to iCOMPEL
3
Output from iCOMPEL
4
Output from iCOMPEL
5
6
Input to iCOMPEL
7
Output from iCOMPEL
8
Input to iCOMPEL
9
Input to iCOMPEL
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.
Raised = Asserted = Logic 0 = +ve voltage = On = Spacing.
The iCOMPEL uses voltage level in order to describe line status since this is the only explicit identification.
Inputs have:
Hysteresis (generally of about 0.5 V).
A threshold level of about +1.5 V.
An input impedance of about 5000 ohms connected to GND (defaults to a -ve voltage state with nothing attached).
An acceptable input range of +/-15 V.
Copyright © 2010-2013 Black Box Network Services. All Rights Reserved.
RS-232 Name
DCD
RxD
TxD
DTR
Sig. GND
DSR
RTS
CTS
RI
724-746-5500 | blackbox.com
Technical Reference
Quiescent State
High impedance
High impedance
-ve voltage level
-ve voltage level
High impedance
-ve voltage level
High impedance
High impedance
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