Datasheet

page 23
v7
USB-UART B
Enabling USB-UART B
communication
If you need to use more than one USB-UART in your
application, you have another USB-UART B connector available
on the board too. Both available USB-UART modules can operate at the
same time, because they are routed to separate microcontroller pins.
USB-UART B communication is being done through a FT232RL
controller, USB connector (CN23) and microcontroller UART
module. To establish this connection, you must connect RX
and TX lines of the FT232RL to the appropriate pins of
the microcontroller. This selection is done using DIP
switches SW12.3 and SW12.4 or SW12.5 and
SW12.6.
When using either USB-UART A or USB-
UART B, make sure to disconnect
all devices and additional boards
that could interfere with the
signals and possibly corrupt the
data being sent or received.
In order to use USB-UART B module on EasyPIC Fusion
™
v7,
you must rst install FTDI drivers on your computer. Drivers can
be found on link bellow:
1
2
3
4
5
6
7
8
9
10
11
12
13
14 15
16
17
18
19
20
21
22
23
24
25
26
27
28
TXD
DTR#
RTS#
VCCIO
RXD
RI#
GND
NC
DSR#
DCD#
CTS#
CBUS4
CBUS2
CBUS3
CBUS0
CBUS1
OSCO
OSCI
TEST
AGND
NC
GND
GND
VCC
RESET#
3V3OUT
USBDM
USBDP
FT232RL
U4
FT232RL
VCC-3.3V VCC-5V
C26
100nF
LD73 LD74
RX-LED2
TX-LED2
R30
4K7
R29
2K2
VCC-3.3V VCC-3.3V
R37
1K0
R38
2K2
1
2
3
4
VCC
GND
D-
D+
CN23
USB B
C24
100nF
C25
100nF
E6
10uF
VCC-5VVCC-5VVCC-3.3V
US B UA RT B
CONNECTOR
FTDI2-D_P
FTDI2-D_N
RX TX
1
2 3 4 5 6 7 8
O
N
SW12
TX-FTDI2
TX-FTDI2
RX-FTDI2
RX-FTDI2
RF13
RF12
RF3
RF2
DATA BUS
In order to enable USB-UART B
communication, you must push
SW12.3 and SW12.4 or SW12.5
and SW12.6 to ON position. This
connects the RX and TX lines to
appropriate microcontroller pins.
Figure 9-1:
USB-UART B
connection
schematic
http://www.ftdichip.com/Drivers/VCP.htm