Microtronics myDatalogEASYplus, Руководство пользователя

Страница: 39 / 139

Chapter 5 Functional principle
If there is a GPRS error (see error codes -975 to -993 in chapter "Modem error" on page 128), then
an internal counter is increased by 2 . If a transmission was completed without errors, i.e. all of the
data was transferred, this internal counter is reduced by 1 . The current GSM network is added to the
ban list if the internal counter reaches the value 6 . The relevant GSM network is automatically
added to the ban list, if the "MODEM CMME ERROR" error occurs (see "Modem error" on page 128)
with parameter 32 (NETWORK NOT ALLOWED) or 529 (MODEM CMME ERROR). The ban list is deleted
if no GSM network can be selected from the list of available GSM networks in the receiving range
taking the ban list into consideration. Another search for GSM networks in the receiving range is
completed once the ban list is deleted and the network selection is completed with the ban list that
is now empty (see step 3 in chapter"Automatic selection of the GSM network" on page 38).
The quality of the data transfer is monitored in addition to the establishment of the GPRS
connection. If the data transmission fails 10 times in succession despite an existing GPRS
connection, the currently selected GSM network is also added to the ban list. The same applies in
this case, which means that if, when taking the ban list into consideration, there is no further GSM
network available, the ban list is deleted and selection of the strongest GSM network is restarted.
Rev. 06 39