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3.4. Powering of the module
The
MT-703
telemetry module can be powered only from the built-in set of batteries of
nominal voltage 4.5 VDC. The batteries are placed inside the special holder under the
main circuit board of the module. They are connected to the board by two-wire cable
with a miniature plug. Such design makes easier the battery
replacing
.
To reduce the initial and operating costs of the module powering, three industry-
standard batteries of R20 type are used. The nominal capacity of such set amounts to
16 Ah, and usually allows for up to 5 years of correct module operation, depending on
the number of transmission cycles. Using the factory-mounted set of batteries allows to
avoid problems arising from an oxidation of contacts during long term operation. It is
recommended to use always the same type of batteries or their equivalent having
similar parameters.
The module can be optionally purchased in a
HC
version having the batteries of
doubled capacity. The operation time of the module in
HC
version increases without the
need of supplying new lithium batteries because inside the bigger housing of the
module there is a set of six alkaline R20 batteries, identical as in a standard module.
They provide the double capacity, and ensure the longer operation of the module even
with frequent measurements.
To reduce the battery energy consumption, the module is powered via
USB cable
from
PC host computer during the configuration procedures. The operation of the module
with external power is indicated by lightning the USB LED. Additionally, during the
module configuration you may set its constant activity option that simplifies the
configuration itself.
3.5. SIM card
The
MT-703
telemetry module is equipped with a standard
SIM
card holder ensuring
the proper connection of a card to the GSM modem. The holder is placed horizontally
on the printed circuit board in the module housing.
The correct placement of the
SIM
card is important for a proper operation of the
module. The module accepts only
SIM
cards built in
3.3 V
low voltage technology.
