4-Channel Hand-Held Wireless Transmitter
1 1 1 1 . INTRODUCTION
The WT-104 is a miniature, 4-channel hand-held wireless trans-
mitter, designed to operate with Visonic Ltd. wireless receivers of
the WR-200 and WR-300 series.
Transmission is activated by pressing any one of the 4 recessed
buttons on the unit. Transmitted data consists of a system code
(see Para. 3.2 below) and one of four different channel codes that
activates the corresponding output of the target receiver.
The transmitter is powered by a 12 volt alkaline battery. An LED
lights during transmission, indicating the battery voltage condition. If
the LED does not light during transmission, the battery must be
All WT-104 units are supplied with a key-holder installed. A neck
chain is also included in the package, to permit the unit to be
worn as a pendant transmitter.
Figure 1. WT-104 with Front Cover Removed
2 2 2 2 . SPECIFICATIONS
Frequency (MHz): 315, 404, 418, 433.92 or other frequencies
Transmit Indicator: Lights if the battery voltage exceeds 8 VDC.
per local requirements.
Operating Temperature: 0° to 49°C (32° to 120°F).
Encoding: 8-bit digital word, 256 combinations, pulse width
Dimensions: 35 x 80 x 18 mm (1-3/8 x 3-1/8 x 3/4 in).
Weight: 28 g (1 oz).
Power Supply: 12-volt alkaline battery (Duracell MN-21, Golden
Power GP-23A, or equivalent).
Standards: Designed to meet FCC Part 15; meets MPT 1340,
Attention: Transmitter characteristics may be affected by battery
ETS 300 220, ETS 300 339 and ETS 300 683 (CE approved).
3 3 3 3 . INSTALLATION
3.1 Battery Installation
C. Carefully position the front cover hole over the LED. Secure
the front cover with the screw (through the back cover).
A. Open the case by removing the screw from the back cover.
B. Insert the 12-volt alkaline battery (Duracell MN-21 or Golden
Power GP-23A or equivalent) between the battery clips, so
A. Carefully position the front cover hole over the LED. Secure
that the (+) and (–) markings on the battery are in the same
the front cover with a screw (through the back cover).
direction as the markings on the P.C. board (close to each
B. Stand 10 feet away from the receiver and press the Channel 1
battery clip - see Figure 1). Check that the battery is held
(Gray) button on the WT-104 .
securely by the battery clips.
Note: Verify that the transmission indicator lights, indicating
C. Gently press one of the pushbutton switches and verify that
good battery condition.
the LED lights, indicating good battery condition.
C. Observe that the receiver LED lights, indicating detection of
the transmitted RF signal.
D. Verify activation of the CHANNEL 1 relay at the receiver.
A. All WT-104 units have an
E. Repeat steps B through D for channels 2, 3 and 4.
(marked 1 to 8). Each switch
F. Operate the transmitter from various locations within the
may be set to ON or OFF
protected area to determine "dead" spots, where transmission
position, to create a unique
is affected by structural materials etc.
digital system code - see
Figure 2. Code Selector
3.4 Neck Chain Installation
Figures 1 and 2.
B. Use a ball point pen to set each of the switches to match the
A. Remove the key-ring leaving the triangle installed on the
code setting of the companion receiver.
bottom of the WT-104.
CAUTION: The code combination 2, 4, 5, 6, 7 ON / 1, 3, 8
B. Open the chain and slip it through the triangle.
OFF is a factory test code which must not be used. Also avoid
codes which are often used: all keys ON, all keys OFF or
alternating ON/OFF settings.