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Opening GPRS
NO
Current operator is in
black operator list
YES
Do not allow to
open GPRS/Send
data
A
Work as usual
Figure 12 Operator search functionality diagram. White list is Roaming Operator lists
5.8
Data Acquisition Mode settings
Data Acquisition modes are an essential part of TMT250 device, they are also highly
configurable.
Through configuration user defines how records will be saved and sent. There are three
different modes: Home, Roaming and Unknown. All these modes with configured data
acquisition and report frequencies depend on current GSM Operator defined in the Operator list
(see section GSM Operators, Roaming, Blacklist Operator list) and are switched when GSM
operator changes (e.g. vehicle passes through a country border).
If current GSM operator is defined as Home Operator, device will work in Home Data
Acquisition mode, if current operator is defined as Roaming Operator, device will work in
Best operator
search
A
White List empty
YES
Black List empty
YES
Skip op search
procedure
A
31
NO
NO
YES
Find new best
operator from
White List
Connect to
strongest signal
exept if in Black
list
A
A
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