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About the development board UART interface

ConnectCore for i.MX51 Hardware Reference Manual

114

Pin Function Defaults to

3 TXD GPIO1_21

4 NC -

5 GND -

6 NC -

7 RTS# GPIO1_14

8 CTS# GPIO1_11

9 NC -

By default, serial port 2 signals are configured as GPIO signals.

Serial port 1, MEI interface, X30

The serial (UART) port 1 connector, X30, is a DB-9 male connector. This asynchronous serial port is

operating in DTE mode and requires a null-modem cable to connect to a computer serial port.

The serial port 1 MEI (multiple electrical interface) interface corresponds to i.MX51 UART port 1. The

line drivers are configured using the switch S6. Refer to Switches and push-buttons for more

information.

Serial port 1 pins are allocated as shown:

Pin RS232 Function RS232 Default RS485 Function RS485Default

1 - - CTS- -

2 RXD GPIO4_28 RX+ GPIO4_28

3 TXD GPIO4_29 TX+ GPIO4_29

4 - - RTS- -

5 GND - GND -

6 - - RX- -

7 RTS# GPIO4_30 RTS+ GPIO4_30

8 CTS# GPIO4_31 CTS+ GPIO4_31

9 - - TX- -

By default, serial port 1 signals are configured as GPIO signals.

Serial port 3, TTL interface, X19

The serial (UART) port 3 interface is a TTL interface connected to a 2x5 pin, 2.54mm connector, X19.

The connector supports only TTL level signals.

The serial port 3 interface is connected to i.MX51 UART port 3.

Serial port 3 pins are allocated as shown:

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