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5
May, 2019
RF transmitter T16
different radio system encodings, two different radio frequencies and with different identification numbers
of the protected object.
The transmitter sends periodic
Test
messages for evaluating connectivity. The reception of these messages
is controlled by the receiving center’s message monitoring software. It is also possible to constantly send
PING
messages, the reception of which is controlled by the receiving center’s reception hardware.
The transmitter automatically checks the power supply voltage. If the voltage falls below 11,5 ±0,2 V, the
transmitter will send a message about the power supply voltage being insufficient. If the voltage rises above
12,6 ±0,2 V, the transmitter will send a message about the power supply voltage being restored.
If the power supply voltage falls below 10 ±0,2 V, the transmitter will switch to sleep mode. Before
switching, the transmitter will send a message about the voltage drop. While operating in sleep mode, the
transmitter does not store or send any messages. The transmitter will switch from sleep mode to ordinary
mode only when 12,6 V power supply voltage
remains stable after switching on the transmitter’s power.
DC power source.
The
T16
must be connected directly to the power terminals (AUX) or 12 V battery
terminals. The cross-sectional area of the transmitter’s power wire should be no less than 1 mm
2
. When
transmitting data, the transmitter consumes 1,2 A of current, so stability of the power supply voltage is
important for reliable operation of the transmitter.
Antenna.
The antenna is very important to ensure a good quality connection
. Use only an antenna specified
for the correct frequency and power. If you are using a 1/4 λ antenna, it must be vertically oriented and
mounted as high as possible. Avoid mounting the antenna in places where metal shields or concrete
partitions would block the reception antenna. The quality of connectivity is best when the transmitter and
receiver antennas are within line of sight of each other. Usually the quality of connectivity can be enhanced
by mounting the antenna as high as possible. The antenna should be connected to the transmitter using
coaxial 50 Ω cable. The longer the cable, the bigger the signal losses in it. It is recommended to use a cable
no longer than 10 meters. When the cable length is less than 5 m, RG-58U or a better cable is
recommended. Use a cable with lower attenuation for longer cables. When the transmitter is installed,
check the quality of the connectivity. To do this, send a few messages and check the signal level in the
receiver. A signal level not lower than 3 is sufficient.
Data cable
. The data cable connecting the radio transmitter and the control panel should be no longer than
50 cm. If the data cable is longer, a shielded cable must be used. The data cable should be connected to
the keypad bus, series port or landline dialer on the control panel. Avoid mounting the cable in parallel
with AC power cables, the antenna cable or other sources of strong electromagnetic field.
RS485 interface
. Modules
W485
and
TM17
can be connected to the transmitter’s RS485 interface. When
the length of the RS485 bus is larger than 1 m, use a twisted-pair cable (STP 4x2x0,5). Avoid mounting the
cable in parallel with AC power cables, the antenna cable or other sources of strong electromagnetic field.
1.2
Specifications
Parameter
Description
Power supply voltage
10-15 V DC
Current consumption
Up to 50 mA (stand-by mode)
Up to 1,2 A (sending mode)
Radio frequencies
136 MHz – 174 MHz (VHF. T16V transmitter)
430 MHz – 512 MHz (UHF. T16U transmitter)
Radio channels
2
RF output resistance
50 Ω
