User's Manual

APPLICANT: MOTOROLA, INC. FCC ID: IHDT6AC1
Exhibit 8
20
4.2.1 Using the SoftGSM.
4.2.1.1 SoftGSM Selection
The selection of SoftGSM is done by Hardware in the user
application.
In order to switch to this mode the user need to connect
pulldown resistors of 22Kohm in the Downlink line (pin no’23
in the zif connector or pin no’22 in the 28 pin) and the
DCS_EN line (pin no’22 in the zif connector or pin no’20 in
the 28 pin).
In this mode the necessary lines are: TXD, RXD.
An example for the circuitry to add the pulldown resistor can
be seen in Pharagraph ??? EV_board design.
4.2.1.2 File / Fax / SMS transfer in SoftGSM mode.
To Transfer a file in softGsm you need to:
1. connect the RX/TX lines of the D15 a a comm port of the
computer. .(the levels should be converted to RS232 or use
a EV board or equivqlent).
2. Run the SoftGsm Application in the computer.
3. The SoftGsm program will open a phone tools application.
4. Use the phone application to send/Receive file/Fax/SMS .