A.2
UART DB9 connectors
There are two DB9 connectors on the back panel that connect to logical UART channels UART0 and
UART1.
The settings in the
config.txt
define the connectivity of the UART system. See
for information on configuring the
UART system.
Note
The DB9 connectors connect to logical UART channels but the connector pins follow the RS232
electrical specification.
The following tables show the pin mapping of the DB9 connectors, UART0 and UART1, on the back
panel.
Table A-5 UART0 DB9 connector signal list
Pin Signal
Pin Signal
1
No connection 2
RX
3
TX
4
DTR
5
GND
6
DSR
7
RTS
8
CTS
9
No connection -
-
Table A-6 UART1 DB9 connector signal list
Pin Signal
Pin Signal
1
No connection 2
RX
3
TX
4
No connection
5
GND
6
No connection
7
No connection 8
No connection
9
No connection -
-
Arm supplies the N1 SDP with ribbon cables making the following connections:
• DB9 connector UART0 on the back panel to header UART0 on the board.
• DB9 connector UART1 on the back panel to header UART1 on the board.
Related information
1.3 The N1 SDP at a glance
A Signal descriptions
A.2 UART DB9 connectors
101489_0000_02_en
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