Radiocrafts
Embedded Wireless Solutions
RC2300DK/RC2301DK
©
2007 Radiocrafts AS
RC2300DK/RC2301DK Demonstration Kit User Manual (rev. 2.0)
Page 5 of 17
RS-232 interface
The Demonstration Board provides an RS232 driver circuit. The serial port is configured as a
data modem and a 1:1 cable should be used to connect the board to the PC. The RTS/CTS
handshaking pair is also provided, so that hardware handshaking may be used on this port.
The serial port (RXD and TXD) and handshaking signals can be HW enabled by doing the
following hardware changes:
•
Insert jumpers at P13 to connect RXD and TXD to the RS232 driver
•
Insert jumpers at P13 to connect CTS and RTS to the RS232 driver if hardware
handshake is to be used
P13 is used to set jumpers to connect the module UART interface to the RS232 PHY driver.
Normally the jumpers connecting RXD and TXD are installed, and provide UART
communication with a PC without handshaking. With the jumpers removed the modules RXD
and TXD can easily be connected to a host using logic levels, for instance a microcontroller or
external development board. The table below shows the pinout and signals at P13.
There are two LEDs indicating traffic activity on the UART. A green LED is connected to the
RXD line, and a red LED at the TXD line.
Pin no.
Signal
Note
1 2 GND
Ground
3
4
VCC
Jumper installed from factory. Can be used for
current measurement
5
6
RXD
Jumper installed from factory
7
8
TXD
Jumper installed from factory
9
10
CTS
Install jumper when using hardware handshake
11
12
RTS
Install jumper when using hardware handshake
13 14 GND
Ground
Figure 3. RS232 driver interface (Photo to be updated!)
Connect jumpers here
for TXD and RXD
Connect jumpers here
for hardware handshake
(CTS, RTS)
