Digi Connect EM Hardware Reference Manual page 23

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Serial Port 1 (P1) and Serial Port 2 (P2)
Serial port 1 and port 2 are DB-9 male connectors labeled P1 and P2. Use the following
figure and table for pin orientation and pin assignment information.
Serial Port Pin Orientation
Signal
Port
Pin 1
1
DCD
Not
2
Connected
GPIO Port (P3)
Serial Pin Assignment
Signal
Signal
Signal
Pin 2
Pin 3
Pin 4
RXD
TXD
DTR
Not
RXD
TXD
Connected
A b o u t t h e D e v e l o p m e n t B o a r d
Pin 1
Pin 5
Pin 6 Pin 9
Signal
Signal
Signal
Pin 5
Pin 6
Pin 7
GND
DSR
RTS
Not
Not
GND
Connected
Connected
Signal
Signal
Pin 8
Pin 9
Not
CTS
Connected
Not
Not
Connected
Connected
2 3

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