Smart Machine Smart Decision
SIM521x EVB User Guide
11.04.2011
13
4.5 RS232 Interface
Figure 7: Serial Port
J306 is 9 pins standard RS232 UART interface. It can be connected to a PC directly.
Table 7: Serial Interface
Pin
Signal
I/O
Description
1 DCD
O
Data carrier detection
2 TXD
O
Transmit data
3 RXD
I
Receive data
4 DTR
I
Data Terminal Ready
5 GND
Ground
6 NC
NC
7 RTS
I
Request to Send
8 CTS
O
Clear to Send
9 RI
O
Ring Indicator
