A.1
UART headers
There are four 5×2 way, no pin 10, UART headers on the N1 board.
The settings in the
config.txt
define the connectivity of the UART system. See
for information on configuring the
UART system.
Note
The headers are logical UART channels but the header pins follow the RS232 electrical specification.
The following table shows the pin mapping of the UART headers, UART0-UART3.
Table A-1 UART0 header signal list
Pin Signal
Pin Signal
1
No connection 2
DSR
3
RX
4
RTS
5
TX
6
CTS
7
DTR
8
No connection
9
GND
-
-
Arm supplies the N1 SDP with a ribbon cable connecting the UART0 header to the UART0 DB9
connector on the back panel.
Table A-2 UART1 header signal list
Pin Signal
Pin Signal
1
No connection 2
No connection
3
RX
4
No connection
5
TX
6
No connection
7
No connection 8
No connection
9
GND
-
-
Arm supplies the N1 SDP with a ribbon cable connecting the UART1 header to the UART1 DB9
connector on the back panel.
Table A-3 UART2 header signal list
Pin Signal
Pin Signal
1
No connection 2
No connection
3
RX
4
No connection
5
TX
6
No connection
7
No connection 8
No connection
9
GND
-
-
A Signal descriptions
A.1 UART headers
101489_0000_02_en
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Appx-A-229
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