Null Start Code Functionality; Slot Footprint; User Interface; Function Switch - Wireless Solution W-DMX TRX Implementation Manual

6.1.3 §10.5.5. NULL START Code functionality.
The W-DMX system forwards all packets regardless of start code in G4S mode, with the
exception of RDM start codes, which are processed internally on RDM enabled devices. In
other radio modes only NULL START Code packages is forwarded.
6.1.4 §10.5.6 Slot footprint.
The W-DMX system has a slot footprint of zero.

7 User Interface

The W-DMX system offers the following user interface options:
1. A push button (called function switch) and one or more status LEDs.
2. Overlay Interface
3. RDM interface
IMPORTANT! The Function Switch and the LED Indicator are the minimum
requirement for a working implementation. Without a way to interact with the system
the user may be left with an inoperable device.

7.1 Function Switch

The function switch can be a simple momentary push button connected between pin J1:4 and
ground or a transistor controlled by a micro controller. Refer to the table below for exact
timings required.

7.1.1 Link

When the button is pressed for a brief period of time the transmitter will link unlinked
receivers within range.

7.1.2 Unlink

On a transmitter holding the button for more than 3s and then releasing it will cause any
linked receivers to unlink.
On a receiver holding the button for more than 3s will cause that receiver to unlink.

7.1.3 Transceiver direction

Cards read the state of pin J1:4 at start up and will, if the pin is low, switch mode. A receiver
becomes a transmitter and vice versa. When J1:4 is held low at boot, the boot loader will be
bypassed, giving control to the main program immediately. Thus the pin only has to be held
low for a very short period of time.

7.1.4 Function Switch Timing

The functionality provided by the Function Switch input and its timing parameters are
described in the table below.
Transceiver
Idle / Normal Operation
Link Receivers
Revision 4
Author: Anders Zellén
12(23)
Time min Time max
- -
100ms 3s
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14/11/2014