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Assign IP 

Caution:

The IP address you assign must be within 

a valid range, be unique to your network, and be 
in the same subnet as your PC.

Note:

For the convenience of assigning an IP address

over your Ethernet network, refer to the “Using ARP 
and Ping” section of the Installation Guide.

1) Connect a null modem cable between your computer 

and the unit’s console port (#1).

2) Open a terminal emulator (e.g., Hyperterminal).
3) Confirm that the configuration parameters are set 

as follows: 

9600 Baud, 8/N/1, Xon/Xoff flow control

.

4) Press the Enter key. 
5) Enter any user name.
6) At the local prompt enter: 

set privileged

7) Enter 

system

for the password.

8) At the local prompt enter: 

change server ipadd [xxx.x.x.xx.]

Configure

1) Open a Web browser.
2) Enter the 

IP address

you just assigned into the URL 

address field.

3) Confirm that the following screen displays:
4)  Click on the 

Port Properties

heading.

The MSS4 network-enables Industrial Automation,
Medical Instruments, modems, and other serial devices.
Each of its four ports can accommodate RS232, RS422, or
RS485 communication.  

The MSS4 delivers remote management and data accessi-
bility through its 10/100BASE-T Ethernet port or its
optional 100BASE-FX fiber link port.  Its two optional PC
card slots provide flash storage or wireless Ethernet.

This Quick Start explains how to connect, configure, and
troubleshoot your unit.  For more detailed information,
refer to the MSS Installation Guide and Reference Manual
on the CD ROM supplied with this product.

Connections

1) Place the MSS4 near your serial devices 
2) Connect your Ethernet cable to the unit’s RJ45 

Ethernet port.

3) Optionally, connect your full duplex fiber optic Ethernet 

cables to the unit’s ST connectors.

Note:

If you wish to use the optional Power Terminal 

Block, refer to the Installation Guide.

4) Connect power (9 to 30 VDC, 3W maximum).
5) Wait about 30 seconds.
6) Confirm that the 

Link

LED lights up.

7) Confirm that the 

OK

LED is slowly blinking.

8) Note the pin assignments of the terminal blocks 

and DB9 connectors:

Power, Serial, Ethernet Connections

MSS4

Quick Start 

MSS4

MSS4

serial 4

serial 3

serial 2

serial 1

pc car

d 1

pc car

d 2

link

ok

10/100

100 BaseFX

TX     RX

se

rial 1

2

3

4

reset

pc car

d

1

2

9-30vdc

Ethernet

Optional 

Fiber

Computer

Serial Device

Reset 

Button

Mounting 

Bracket

Optional 
  PC Card
   Slots (2)

Power 

 Terminal

   Block

RJ45 

Jack

Console

Port

5

1

9

6

RX

TX

DTR

CTS
RTS
DSR

Grd.

1

5

6

9

NC

TX+

RX+

NC

TX-

RX-

7                                     1

DSR

CTS

RX

Grd.

TX

RTS

DTR

7                                     1

NC

RX-

RX

÷

Grd.

TX

÷

TX-

NC

RS-485

RS-232

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