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Operational Specifications 
3.1.2 Serial Port Connector (J3) 
Rev.1.0  Dec 15, 2006 
3-5
REJ10J0917-0100  
 
 
 
3 
3.1.2 Serial Port Connector (J3) 
 
The M3A-HS49 includes a serial port connector (J3) for serial communication. 
Figure3.1.4 shows a pin assignment of serial port connector. 
 
 
Top view of the
component side
Board edge
Side view
Board edge
1
6
1
6
5
9
5
9
 
 
Figure3.1.4 Pin Assignment of Serial Port Connector (J3) 
 
Table3.1.3 lists pin assignments of serial port connector. 
 
Table3.1.3 Pin Assignments of Serial Port Connector (J3) 
Pin Signal 
Name Pin Signal 
Name 
1 NC 
6 DSR
_______
2 RXD 
7 RTS
_______
3 TXD 
8 CTS
_______
4 
DTR
_______
9 NC 
5 GND 
 
 
Pins 4-6 are loopback-connected. Pins 7-8 are loopback-connected.