Reference Manual

79 ConnectCore 9M 2443 & Wi-9M 2443 Hardware Reference
Chapter 2
Serial port B,
MEI interface,
X16
The serial (UART) port B connector X16 is a DSUB9 male connector. This
asynchronous serial port is DTE and requires a null modem cable to connect to a
computer serial port.
The serial port B MEI (multiple electrical interface) interface corresponds to
S3C2443 UART port B. The line drivers are configured using switch S6.
Note that all port B pins are allocated as shown:
By default serial B signals are configured to their respective GPIO signals. It is the
responsibility of the driver to configure them properly.
Serial port C,
TTL interface,
X19
Pin RS232
function
RS232
default
RS485
function
RS485
default
1CTS-n/a
2 RXD GPH3 RX+ GPH3
3 TXD GPH2 TX+ GPH2
4RTS-n/a
5 GND - GND -
6RX-n/a
7 RTS# GPH11 RTS+ GPIO11
8 CTS# GPH10 CTS+ GPH10
9TX-n/a
Pin Function Defaults to
1NC
2NC
3 RXD2 GPH5
4 RTS2#/TXD3 GPH6
5 TXD2 GPH4
6 CTS2#/RXD3 GPH7
7NC
8NC
9GND
10 +3.3V