Alps Electric Virtual Cable Light Module - Manual (Page 4)

CONFIDENTIAL Rev 1.0
Copyright  2003 ALPS Electric Co. LTD.
“BLUETOOTH TM is a trademark owned by the Bluetooth SIG Inc, and licensed to ALPS
ELECTRIC Co. LTD”
3. Operation
In this section, it shall be described to the user how to connect and operate the
ALPS hardware platform when connected to the users’ PC. Also the function of
each switch will be covered.
3.1 Line Driver Power Switch
The board that is marked FX778Z11a (Serial Line Driver Board), contains one
switch that needs to be set depending on what power supply configuration the
user will adapt. The user can select either “EXT” mode or “INT” mode.
If the user selects “INT”, this board will be powered from the board marked
FX778Z11b. This board converts from RS232 levels to TTL and Vice Versa. The
D-SUB 9 pin connector is connected via a Serial “straight” Cable to the users’ PC
or embedded communication platform. The logic states of the RS232 signals can
also be monitored as each signal line is also connected to an LED.
3.2 Data-Command control switch.
This switch is located on the left-hand side of the USB connector on the board
marked FX778Z11b. The Virtual Cable light must have some way of knowing if
incoming data to the module is command or user data.
If the switch is set in the 3.3V position, the module recognizes this as a logic “1”
setting and allows the data to pass through as user data. If the switch is set in the
GND position, the module recognizes this as a logic “0” and will run all data
through its’ parser to process the AT-command being sent by the user.