User`s guide

UART via USB
Modern PC computers, laptops and notebooks are
no longer equipped with RS-232 connectors and
UART controllers. They are nowadays replaced with
USB connectors and USB controllers. Still, certain technology
enables UART communication to be done via USB connection.
FT232RL from FTDI® convert UART signals to the appropriate USB
standard. In order to use USB-UART module on EasyPIC
™
v7, you must
rst install FTDI drivers on your computer. Drivers can be
found on Product DVD:
USB-UART communication is being done through
a FT232RL controller, USB connector (CN32),
and microcontroller UART module. To establish this connection,
you must put J3 and J4 jumpers in the USB-UART
position, and connect RX and TX lines to the
appropriate pins of the microcontroller.
This connection is done using DIP
switches SW1 and SW2.
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
U2
FT232RL
VCC-5V
C32
100nF
RX-LED
TX-LED
R9
4K7
R8
2K2
R78
4K7
R79
10K
1
2
3
4
VCC
GND
D-
D+
CN32
USB B
C34
100nF
C50
100nF
E12
10uF
VCC-5VVCC-5V
TX-FTDI
RX-FTDI
USB UA RT
CONNECTOR
TXRX
VCC-MCU VCC-MCU VCC-MCU
VCC-MCU
1 2 3 4 5 6 7 8
O
N
SW1
RX-FTDI
RX-232
RX
1 2 3 4 5 6 7 8
O
N
SW2
TX-FTDI
TX-232
TX
RB1
RB4
RB2
RC7
RA3
RB5
RC5
RD7
RB2
RB1
RB5
RC6
RA2
RB7
RC4
RD6
J3
J4
DATA BUS
Figure 7-1: USB-UART connection schematic
Enabling USB-UART
In order to enable USB-UART
communication, you must set J3
and J4 jumpers in the USB-UART
position, and enable desired RX
and TX lines via SW1 and SW2 DIP
switches. For example, if you want
to enable USB-UART connection
on UART1 module of the default
PIC18F45K22 chip, you should
enable SW1.1 (RC7) and SW2.1
(RC6) lines.
DVD://download/eng/software/development-tools/
universal/ftdi/vcp_drivers.zip
page 17
communication
19122011
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