DSB45 Development Support Box
Confidential / Released
s
DSB45_HD_V05
Page 16 of 50
01.02.2008
2.7 Application
interfaces
The DSB45 Development Support Box offers two basic modes of operating the connected
GSM module:
Internal application mode
•
Transfers signals to the internal application implemented on the DSB45.
External application mode
•
Transfers signals to an external application provided by the customer and connected to
the 40-pin connector X152.
To select either mode use the application switches X101 - X120. For a description and
default settings of the application switches see Figure 3 and Table 17.
The two analog audio interfaces 1 and 2 are not accessible on the 40-pin connector X152.
To connect analog audio devices you may use either the connectors X502 and X603
(internal), or the test pins 33 - 40 on the X153 connector. Use the slide switches X123 –
X130 to enable (on) or disable (off) the accessibility of the X502 and X603 connectors. See
also Figure 3.
Several interfaces and lines are applicable both to internal and external application and do
not need to be adjusted to either mode. These are the following:
•
BATT+ supply voltage
•
SIM interface (SIM card holder)
•
Battery charging circuit and charging connector
2.7.1
Internal application mode
The internal application mode transfers signals to the internal application implemented on the
DSB45. It activates the following functional units of DSB45:
•
RS-232 interface X201 (COM1). See Chapter 2.7.3.
•
RS-232 interface X202 (COM2). Applicable only if supported by the GSM module. See
Chapter 2.7.4.
•
DAI interface X203. Applicable only if supported by the GSM module. See Chapter
2.7.5.3.
Note: X203 is not applicable to the MC55i module. The DAI of MC55i can be used only in
external application mode.
•
RTC supply C101. See Chapter 3.1.6.
•
Non-locking ignition key X132. See Chapter 2.5.1.
•
Non-locking emergency-off / power-off key X131. See 2.5.2
To operate the GSM module with the internal DSB45 application, the slide switches X101 -
X120 must be set to “Internal” position as shown in Figure 3.
