CP2102-EK
Rev. 0.5
5
6.2. UART Signals (J1, J2)
A RS232 transceiver circuit and DB-9 connector (J1) are provided on the evaluation board to connect the CP2102
virtual serial port to external serial devices. See Table 2 for the RS232 J1 pin descriptions. The J2 connector is pro-
vided to facilitate direct access to the CP2102’s UART signals. Shorting blocks on J2 are required to connect the
UART signals to J1. See Table 3 for J2 pin descriptions.
Table 2. RS232 Pin Descriptions
Pin
Signal
CP2102 Direction
Description
1
DCD
Input
Data Carrier Detect
2
RXD
Input
Receive Data
3
TXD
Output
Transmit Data
4
DTR
Output
Data Terminal Ready
5
GND
Ground
6
DSR
Input
Data Set Ready
7
RTS
Output
Request to Send
8
CTS
Input
Clear to Send
9
RI
Input
Ring Indicator
Table 3. J2 Pin Descriptions
Pins
Signal
CP2102 Direction
Description
1-2
TXD
Output
Transmit Data
3-4
RXD
Input
Receive Data
5-6
DTR
Output
Data Terminal Ready
7-8
RI
Input
Ring Indicator
8-10
DCD
Data Carrier Detect
11-12
DSR
Input
Data Set Ready
13-14
CTS
Input
Clear to Send
15-16
RTS
Output
Request to Send
