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www.moxa.com/support 

The Americas:  +1-714-528-6777 (toll-free: 1-888-669-2872) 

Europe:  +49-89-3 70 03 99-0 

Asia-Pacific: +886-2-8919-1230 

China:  +86-21-5258-9955 (toll-free: 800-820-5036) 

 

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Earth Ground: Refer to the following figure for the location of the 
Earth Ground on the terminal block power connector. Connect the 
EG wire to an appropriate grounded metal surface. 

EG

 

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VGA and DVI-D Outputs 
The MPC-122-K comes with a D-Sub 15-pin female connector on 
the front panel to connect a VGA CRT monitor. It also comes with 
a DVI-D connector on the front panel to connect to a panel with 
HDMI (High-Definition Multimedia Interface). 

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Ethernet Ports 
The 10/100/1000 Mbps Ethernet ports use RJ45 connectors. 

Pin 

10/100 Mbps  1000 Mbps 

1 ETx+  TRD(0)+ 
2 ETx- 

TRD(0)- 

3 ERx+  TRD(1)+ 
4 – 

TRD(2)+ 

5 – 

TRD(2)- 

6 ERx- 

TRD(1)- 

7 – 

TRD(3)+ 

8 – 

TRD(3)- 

 

1

8

8

1

 

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Serial Ports 
The serial ports use DB9 connectors. Each port can be configured 
by software for RS-232, RS-422, or RS-485. The pin assignments 
for the ports are shown in the following table: 

Pin  RS-232  RS-422  RS-485 

4-wire 

RS-485 
2-wire 

1 DCD  TxDA(-) 

TxDA(-)  – 

2 RxD  TxDB(+) 

TxDB(+)  – 

3 TxD 

RxDB(+) 

RxDB(+)  DataB(+) 

4 DTR  RxDA(-) 

RxDA(-)  DataA(-) 

5 GND  GND  GND  GND 
6 DSR  – 

– 

– 

7 RTS 

– 

– 

– 

8 CTS 

– 

– 

– 

 

1 2 3 4 5

6 7 8 9

 

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CF Card Slot 
The MPC-122-K computer comes with a CompactFlash socket 
located on the front panel. Remove the protective cap on the front 
panel to install the CompactFlash card. 

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USB Hosts 
The MPC-122-K has six USB 2.0 full speed hosts that use a type A 
connector on the front panel of the computer. An additional USB 
port is located on the display. The port supports a keyboard and 

mouse, and can also be used to connect a Flash disk for storing 
large amounts of data. 

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Audio Interface 
The MPC-122-K comes with an audio input and an audio output, 
allowing users to connect a speaker or an earphone. 

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Reset Button 
Press the “Reset Button” on the front panel of the MPC-122-K to 
reboot the system. The Ready LED will blink on and off for the first 
5 seconds, and then maintain a steady glow once the system has 
rebooted. 

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Real-time Clock 
The MPC-122-K's real-time clock is powered by a lithium battery. 
You should not replace the lithium battery without help from a 
qualified Moxa support engineer. If you need to change the battery, 
contact the Moxa RMA service team. 

 

ATTENTION 

There is a risk of explosion if the battery is replaced with an
incorrect type of battery. 

 

7.

 

Powering on the MPC-122-K 

To power on the MPC-122-K, connect the “terminal block to power 
jack converter” to the MPC-122-K’s DC terminal block (located on 
the side panel), and then connect the power adaptor. Press the 
Power Switch button to turn on the computer. Note that the Earth 
Ground wire should be connected to the top pin of the terminal 
block. It takes about 30 seconds for the system to boot up. Once 
the system is ready, the Power LED will light up. 
 
 
 
 
 

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