5.4  Connecting to a PC for Serial Communication 
The procedure below describes how to connect the device to a computer for serial RS-232 
communication. The method depends on the MP-124 model. 
5.4.1  MP-124 Rev. D 
MP-124 Rev. E provides serial interface through the DB-9 port located on the rear panel: 
  Connector pinouts: 
Figure  5-25: DB-9 Connector Pinouts for Serial Interface 
 
  To connect MP-124 Rev. D to a computer for serial communication: 
1.  Connect the DB-9 connector  on one end of the cable to the device's  RS-232 port 
(labeled RS-232). 
Figure  5-26: Connecting MP-124 Rev. D for Serial Communication  
 
2.  Connect the DB-9 connector  at the other end of the cable to the COM RS-232 
communication port on your computer.  
Once you power-up the device, the Ready and LAN LEDs on the front panel light up green 
(after a self-testing period of about a minute). Any malfunction in the startup procedure 
changes the Ready LED to red.