Leprecon APC Architectural Preset Control - Manual (Page 13)

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Notes regarding each jumper option:
1 - Termination
In a properly configured DMX system, there is a single transmitter, many receivers
connected in a daisy chain, and the last receiver in the data line is terminated.
Putting a jumper on JP1 will add 120 ohms across the DMX line, terminating the line
to prevent reflection.
2 - Master Enable
Each APC system must have one and ONLY one panel set as the 'Master' panel.
This will be the panel that is used to program the system. Generally a position near
the control console will be the easiest to program, although any panel can be set as
Master. If different types of panels are used (3P, 6P, 12P) the Master panel must be
the largest panel, or the same size as the largest panel to allow all scenes to be
programmed.
3 - Arch / Backup
When used with an external console, APC panels are disabled when DMX signal is
present from the console.
When the console is turned off, there are two ways the panels can respond:
· Architectural mode - The APC panel will fade up the last preset selected.
· Backup mode - The APC panel will continue to send the last scene from the
console. All panel presets will blink, prompting the operator to select a particular
playback.
4 - Single Station
If only one panel is used in a system, set that panel as Master and Single Station.
6 - No DMX when off
When this mode is set by placing a jumper on JP6, the APC system will stop sending
DMX when no console is present and no panel presets are on. This can be useful for
turning off some intelligent fixtures that monitor the DMX line, and automatically
'lamp off' when there is no control signal.