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ConnectCore
f or
i.MX51
©
2011
Digi
International,
Inc.
111
Serial port 2 pins are allocated as shown:
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 the "Switches and Push-
buttons" section of this document for more information.
Serial port 1 pins are allocated as shown:
Pin
Function
Defaults to
1
NC
-
2
RXD
GPIO1_20
3
TXD
GPIO1_21
4
NC
-
5
GND
-
6
NC
-
7
RTS#
GPIO1_14
8
CTS#
GPIO1_11
9
NC
-
Pin
RS232
Function
RS232
Default
RS485
Function
RS485
Default
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-
-
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