R8C/3MK Group
USB-to-Serial Communication Conversion Demo Board
R0K5R8C3MDU30BR Instruction Manual
R01AN1051EJ0100 Rev.1.00
Page 16 of 38
Mar 21, 2012
The following outlines the process until communication is achieved using the terminal software on the PC. For
more details, refer to the application note titled “Renesas USB Device USB Peripheral Communications
Devices Class Driver (PDCD).”
1) Connection to USB Host (PC)
(1) Connect the demo board to the USB Host (PC) using the USB cable (A-miniB).
(System definition file (CDC_Demo.inf) is required for the initial connection.)
(2) Confirm the COM number (Windows: device manager)
2) Start up Terminal Software
(1) Enter the confirmed COM number in the terminal software.
(2) Set the communication speed
Set baud rate from 4800bps to57600bps.
(3) Set all other parameters for serial port
Set the following setting
Data length: 8 bits; parity: none; stop bit: 1 bit; flow control: none
The example of data communication with a RS232C transceiver as an external UART device is shown in
Figure 11. Figure 12 shows the example of the setting parameters for serial port on the terminal software.
UART
communication
Terminal software
Text screen
1."ABCDefg
”
2."12345678"
RS
23
2C
Se
riial
PO
RT
Terminal software
Text screen
Text Data
1. "ABCDefg
”
2. "12345678"
Text Data
UA
RT
0
US
B
US
B
1. "ABCDefg
”
2."12345678"
USB
communication
USB CDC
Host Device
UART
communication
This Product
Text Data
1. "ABCDefg
”
2. "12345678"
Text Data
RS23
2C
RS232C
communication
PC with
RS232C serial
port
RS232C
Transceiver
UA
RT
Text Data
1. "ABCDefg
”
2. "12345678"
Text Data
Figure 11 Example of Data Communication using USB-to-UART Communication Conversion
