Siemens TC35i - Manual (Page 20)

TC35i Terminal Hardware Interface Description
Confidential / Released
TC35i_T_HD_v01.05 Page 20/37 10.07.2003
3.5.2 RTC
The internal Real Time Clock (RTC) of TC35i Terminal is supplied from a dedicated voltage
regulator which is also active when TC35i Terminal is in POWER DOWN mode. The RTC
retains the time and is necessary for the reminder function (even if TC35i Terminal is
disconnected from power supply, see Table 11 for details). For example, you can set an
alarm by using the AT+CALA command. Once the alarm time is reached, a reminder URC
will be returned. See [1] for detailed instructions on use of the command AT+CALA. Please
note that the alarm mode described in [1] is not intended for TC35i Terminal.
It is not recommended to power down TC35i Terminal after setting an alarm, because an
alarm call does not wake up TC35i Terminal from POWER DOWN mode.
3.6 Upgrading TC35i Terminal firmware
The TC35i Terminal firmware can be easily upgraded to the latest firmware releases.
The terminal offers two different solutions for updating firmware. In most cases, you can
update the firmware via the RS-232 interface. In case you wish to use the SIM interface you
will need to purchase a special adapter named BB35 Bootbox. Ordering information can be
found in Chapter 7.
The latest software releases can be obtained from your local Siemens dealer or visit the
Siemens homepage.
3.6.1 RS-232 interface
Via RS-232 interface, the host controller controls the TC35i Terminal and transports data.
Figure 5: Pin assignment RS-232 (D-Sub 9-pole female)
EMC immunity complies with the vehicular environment requirements according to
EN 301 489-7.
5 4
3 2
1
8
9
6
7