User`s guide

USB-UART B
Enabling USB-UART B
communication
page 23
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,
which are outputs of dierent on-chip UART controllers.
USB-UART B communication is being done through a FT232RL
controller, USB connector (CN9), and microcontroller UART
module. To establish this connection, you must connect RX
and TX lines of the microcontroller to the appropriate
input and output pins of the FT232RL. This
selection is done using DIP switches SW10.3
and SW10.4.
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 EasyMx PRO
™
v7,
you must rst install FTDI drivers on your computer. Drivers
can be found on Product DVD:
A
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DVD://download/eng/software/development-tools/
universal/ftdi/vcp_drivers.zip
EasyMx PRO
v7
USB UART B
CONNECTOR
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
U3
FT232RL
VCC-3.3V VCC-5V
C27
100nF
LD3 LD4
RX-LED2
TX-LED2
R29
4K7
R28
2K2
VCC-3.3V VCC-3.3V
R31
4K7
R34
10K
1
2
3
4
VCC
GND
D-
D+
CN9
USB B
C12
100nF
C13
100nF
E4
10uF
VCC-5VVCC-5VVCC-3.3V
FTDI2-D_P
FTDI2-D_N
RX TX
1 2 3 4 5
6
7 8
O
N
SW10
TX-FTDI2
RX-FTDI2
PD2
PD3
DATA BUS
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All other tradmarks are the property of their respective owners.
Unauthorised copying, hiring, renting, public performance and
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20122011
www.mikroe.com
In order to enable USB-UART B
communication, you must push
SW10.3 (PD3) and SW10.4 (PD2)
to ON position. This connects the
RX and TX lines to PD2 and PD3
microcontroller pins and its UART
module.
Figure 9-1:
USB-UART B
connection
schematics