User's Manual

V3d Product Specification, Version 2.06
3.1.7.2 Configuration
The minimum number of consecutive readings shall be user programmable, changeable over-
the-air through either network or locally. Also the consecutive threshold can be disabled, such
that no event message is generated.
The circuit enables customization of the inputs to adapt to varying sensors. The basic diagram
is shown below. Rectangular blocks represent spaces where SMT 1/8W resistors can be
placed (possibly 0 ohm). Production values are shown in the blocks. The translation of voltage
to digital 1 or 0 value at point B is to be included in subsequent design documentation.
3.1.8 Digital Output
A single digital output circuit is to be wired to the front panel 20-pin Conxall connector. It is a
simple 3.3V digital output, ESD protected, and limited to 100 mA.
3.2 Wireless Communications
3.2.1 GSM Cellular
The Short Message Service (SMS) is the ability to send and receive text messages to and from
mobile devices, over traditional GSM. The text can be comprised of words or numbers or an
alphanumeric combination and can be no greater than 160 characters (140 octets) in length.
A message sent to a device is first received by a Short Message Service Center (SMSC), which
then directs it to the appropriate mobile device. To do this, the SMSC sends a SMS Request to
the home location register (HLR) to find the roaming device. Once the HLR receives the
request, it responds to the SMSC with the device’s status: 1) inactive or active 2) where device
is roaming. If the response is 'inactive', then the SMSC holds onto the message for a period of
time. When the device awakens, the HLR sends a SMS Notification to the SMSC, and the
SMSC attempts delivery.
The SMSC transfers the message in a Short Message Delivery Point-to-Point format to the
serving system. The system pages the device, and if it responds, the message gets delivered.
The SMSC receives verification that the message was received by the end user, then
categorizes the message as 'sent' and will not attempt to send again.
3.2.1.1 Quad Band Operation
The GSM transceiver used within the V3d must be capable of communicating on any of the four
globally regulated GSM frequency bands, commonly referred to as the 850, 900, 1800 and 1900
MHz bands, making it usable across the globe.
0 Ω
DNA
B
A
Digital Ground
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