Videx GSM4K/4G - UTC TIME ZONE FOR COUNTRIES AHEAD OF UTC (TZ+); UTC TIME ZONE FOR COUNTRIES BEHIND UTC (TZ-)

66250754-4G-EN - V2.0 - 28/03/22
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4000 Series GSM Audio Intercom - Technical Manual
4000 Series GSM Audio Intercom with Proximity
Programming the GSM Intercom
1111NTZnn Set the mode of the GSM’s internal clock to obtain the current time & date updates, where nn = 00 (no
automatic time updates), 01 (default, time taken from the phone network provider) or 02 (time taken
from an NTP server, UTC time).
1111NTZnn? As above and also send a conrmation text back to the sender.
1111NTZ? Query which mode the time & date updates is set to and send a conrmation text to the sender.
For the network providers that do not support the NITZ format, mode 02 can be set. This mode utilises the NTP server protocol
which is an internet protocol that is used to synchronise the clocks on computer networks to coordinated universal time (UTC). It
enables the GSM to request and receive UTC data from an NTP server that, in turn, receives precise time from an atomic clock.
When mode 02 is set the following 3 additional programming commands become available to the user: TZ+, TZ- and DST. These
additional commands allow the user (depending on where/which country in the world they are installing the GSM intercom
module) to manually setup the GSM in the correct Time Zone using the TZ+ or TZ- commands and if the Time Zone they are in also
requires a daylight savings time adjustment then they can use the DST command.
IMPORTANT NOTE: It should be noted that the coordinated universal time (UTC) is the basis for civil time today. This 24-hour
time standard is kept using highly precise atomic clocks. Therefore when setting up the TZ+, TZ- and DST automatic time
correction features the Time Zone (UTC+0) used is taken from the GMT UK based time of '0', i.e. Time Zone (UTC+0) = UK
standard time (GMT) = 0.
UTC TIME ZONE FOR COUNTRIES AHEAD OF UTC TZ+
If the GSM module is being installed in a Time Zone ahead of Time Zone (UTC+0) then the command 1111TZ+nn can be used to
set the correct time ahead. The time adjustments are made in increments of 15 minutes (e.g. 1 increment = 15 minutes), so an hour
adjustment ahead of Time Zone (UTC+0) will be equal to 04 increments, an adjustment of 2 hours ahead of Time Zone (UTC+0) will
be equal to 08 increments and so on.
By default the value nn is set to 00 (i.e. Time Zone (UTC+0) = UK standard time (GMT) = 0). The following commands can be used
to set the time ahead and conrm.
1111TZ+nn Adjust the GSM’s time zone ahead of Time Zone (UTC+0) by nn increments, where nn = value between
00 (default) to 48.
1111TZ+nn? As above and also send a conrmation text back to the sender.
1111TZ+? Query the time zone adjustment setting and send a conrmation text to the sender.
Example - setting the Time Zone to Rome, Italy, Europe (1 hour ahead):
If the 4G GSM module is being installed in Rome, Italy and the network provider used does not support NITZ, the NTZ command
would be set to mode 02 = 1111NTZ02. As the European time zone = 1 hour ahead of Time Zone (UTC+0) the adjustment will be
4 increments of 15 minutes = 1 hour. Therefore the following command can be sent to the 4G GSM module:
1111TZ+04?
The ? is included in the example for a conrmation back from the GSM. The GSM intercom will reply with the following text:
TZ+04
VIDEX 4G
UTC TIME ZONE FOR COUNTRIES BEHIND UTC TZ
If the GSM module is being installed in a Time Zone behind Time Zone (UTC+0) then the command 1111TZ-nn can be used to set
the correct time behind. As with the TZ+ command the time adjustments are made in increments of 15 minutes (e.g. 1 increment
= 15 minutes), so an hour adjustment behind Time Zone (UTC+0) will be equal to 04 increments, an adjustment of 2 hours behind
Time Zone (UTC+0) will be equal to 08 increments and so on.
By default the value nn is set to 00 (i.e. Time Zone (UTC+0) = UK standard time (GMT) = 0). The following commands can be used
to set the time behind and conrm.
1111TZ-nn Adjust the GSM’s time zone behind Time Zone (UTC+0) by nn increments, where nn = value between
00 (default) to 48.
1111TZ-nn? As above and also send a conrmation text back to the sender.
1111TZ-? Query the time zone adjustment setting and send a conrmation text to the sender.
Example - setting the Time Zone to New York, USA, North America (5 hours behind):
If the 4G GSM module is being installed in New York, USA and the network provider used does not support NITZ, as with the TZ+
command in the previous example the NTZ command would be set to mode 02 = 1111NTZ02. Since New York is on the Eastern
coast of the USA it falls into the Eastern Standard Time (EST) time zone = 5 hours behind Time Zone (UTC+0). The adjustment will
therefore be 20 increments of 15 minutes = 5 hours. The following command can be sent to the 4G GSM module:
1111TZ-20?