V A R - E X T - C B 1 0 3 R E V 1 . 0
E X T E N S I O N B O A R D
3.2 UARTs
3.2.1
RS232 connectors assignment
Connector VAR-SOM-OM35 VAR-SOM-MX25
UART A (J4)
UART 2
UART 2
UART B (J8)
UART 1
UART 3
3.2.2
RS232 connectors pin out
Pin #
Type
Description
1
NC
2
I UART
Receive
3
O
UART Transmit
4
NC
5
Power
GND
6
NC
7
O
UART RTS
8
I
UART 3 CTS
9
NC
10
NC
3.3 JTAG Connectors
3.3.1
JTAG In (J12)
Pin #
Pin
Function
1
TDO
2 EMU1
3
nTRST
4 EMU0
5
TDS
6 NC
7
TDI
8 NC
9
TCK
10 GND
3.3.2
JTAG Out (J11)
Pin #
Pin
Function
1
TMS
2 nTRST
3
TDI
4 GND
5
VIO
6 NC
7
TDO
8 GND
11 Data Sheet Rev 1.0
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