User's Manual

APPLICANT: MOTOROLA, INC. FCC ID: IHDT6AC1

Exhibit 8

4.2.2 Using RS232.

4.2.2.1 RS232 Selection

The RS232 is the default setting in the D15 and no HW

selection is needed.

The RS232 can use 3 different modes of setting to the DTE

device:

HW (Hardware) flow control – all RS232 lines are used (DTR,

DSR, RTS, CTS, TXD, RXD, DCD, RI, GND).

None flow control – DTR, DSR, TXD, RXD, DCD, RI, GND are

required.

Xon / Xoff flow control – DTR, DSR, TXD, RXD, DCD, RI, GND are

required.

4.2.2.2 work with RS232 with "sleep mode"

If the D15 will have no accessories and the unit is camped the

D15 will go to a "sleep mode" (current save mode).

During this period of time the RS232 is not responding to any

command from the DTE device(Uart is not activated).In order to

make the unit to wake up when the DTE will like to communicate

with the radio the user have two options:

1. Activate the RTS During all the DTE/DCE dialog. (Internaly

the TS line will be activated). After the communication

disable the RTS in order to go back to sleep mode.

2. Activate the TS During all the DTE/DCE dialog. After the

communication disable the TS in order to go back to sleep

mode.