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Fastrack Supreme User Guide
Functional Description
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Page: 51 / 77
7.2
EU and US Bands
7.2.1
General Presentation
The FASTRACK Supreme is a quad band Plug & Play. It supports either EU bands (EGSM900/DCS1800)
or US bands (GSM850/ PCS1900), depending on the band setting within the Plug & Play. Users are free to
switch between EU bands and US bands by simple AT commands when the selected bands are supported.
7.2.2
AT COMMAND for Bands Switch
EU/US band is easily switched/checked by AT command
AT+WMBS
.
For detail, please refer to Section 5.7 and 5.8.
7.3
Power Supply
7.3.1
General Presentation
The FASTRACK Supreme is supplied by an external DC voltage (V+BATTERY) from +5.5 V to +32 V at 2.2
A.
Main regulation is made with an internal DC/DC converter in order to supply all the internal functions with a
DC voltage.
Correct operation of the FASTRACK Supreme in communication mode is not guaranteed if input voltage
(V+BATTERY) falls below 5.5 V.
Note:
The minimum input voltage specified here is at the FASTRACK Supreme input. Be careful of the input
voltage decrease caused by the power cable. See paragraph 8.2.1 for more information.
7.3.2
Protections
The FASTRACK Supreme is protected by a 800 mA / 250 V fuse directly bonded on the power supply cable.
The FASTRACK Supreme is also protected against voltage over +32 V.
Filtering guarantees:
•
EMI/RFI protection in input and output,
•
Signal smoothing.
7.4
RS232 Serial Link
7.4.1
General Presentation
The RS232 interface performs the voltage level adaptation (V24/CMOS
⇔
V24/V28) between the internal
FASTRACK Supreme Plug & Play (DCE) and the external world (DTE).