Digi Connect EM Hardware Reference Manual page 23

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