©2013 e-Gizmo Mechatronix Central
Page 3 of 5 pages
Multi Channel UHF Data Transceiver
Vcc
GND
TX
RX
LOC
DIO
RXD TXD GND Vcc
HOST MICROCONTROLLER
Vcc
GND
TX
RX
LOC
DIO
RXD TXD GND Vcc
D0 D1 D2 D3
HOST MICROCONTROLLER
APPLICATION INFO
The MUDT will work with any microcontroller MCU
of your choice, including the gizDuino series. A
hardware UART is a necessary feature (advance
programmers, of course, can do it even without
hardware UART). It will work equally well with
either a 5V or 3.3V MCU. Keep in mind a jumper
must be installed across JP2 if the MUDT is run on
a 3.3V based MCU circuit.
Channel Selection.
The MUDT-433 is optimized for operation in the
433.98MHz (Channel 8, jumper on D3 only) set-
tings. Likewise, MUDT-315 works best when set
to channel 8. There will be slight degradation in
the performance, worsening further as the chan-
nel is set further away from channel 8. The effect,
however, will be barely noticeable if the MUDT is
operated at short distances away from each other
(not more than 200 meters).
Therefore, if your application has no need to
change channel, it is best to keep the default chan-
nel 8 settings.
To select a different channel, simply install the
jumpers corresponding to the desired channel. In
environment where a number of these transceivers
in use are within range, select channels separated
by at least two slots to minimize possible interfer-
ence from other pairs in the vicinity.
Channel selection can be transferred under host
MCU control by connecting the assigned control
I/O of the host MCU to the channel select port,
as shown in ! gure 5. Needless to say, you have
to remove all the jumpers installed on it, not just
for the sake of correct operation, you cant install
anything else anyway if the jumper are installed.
Note that the rule of channel selection is reversed
logic, thats it, a logic 0 input is read as logic 1 by
the MUDT.
Figure 4.
An interfacing wiring example with a
Host Controller. LOC connection is optional and is
needed only if the RSSI feature is used.
Figure 5.
Channel selection can be put under
MCU control. Four MCU I/Os selects the de-
sired channel on the ! y.
