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Installation
A. Switches 1 through 3 control wire mode. For more information on wire
modes, see RS-485 Networking Overview on page 1-2.
For two-wire mode, set switches 1 through 3 to the On position. For four-
wire mode, set switches 1 through 3 to the Off position.
B. Switches 4 and 5 control termination. RS-485 networks should only be
terminated at the extreme ends.
For termination in two-wire mode, set switch 4 to the On position and
switch 5 to the Off position. For termination in four-wire mode, set both
switches to the On position. To disable termination, set both switches to the
Off position.
C. Switches 6 and 7 control RX (receive) biasing. Biasing makes sure that there
is a valid idle signal when no units are transmitting, but may not be needed
on your network.
To enable biasing, set both switches to the On position. To disable biasing,
set both switches to the Off position.
NOTE: The MSS biasing value is 4.7K Ω .
D. Switch 8 controls grounding of the shielding. RS-485 serial cabling should
generally have one device providing ground.
For a grounded shield, set switch 8 to the On position. For a floating shield
(no ground), set switch 8 to the Off position.
6.
Provide power to the MSS.
Attach one end of the power cable to the MSS and plug the other end into a wall
outlet. There is no power switch on the MSS; power will come on automatically
when the unit is plugged in. At this point, there is power to the server, so be sure
to use appropriate care when handling the unit.
NOTE: Ensure that you are using the MSS six volt power supply. The Lantronix EPS1,
EPS2, and LRS2 units have a power supply that looks similar to the MSS power
supply, but is a different voltage. Using the wrong power supply with the MSS will
damage the MSS.
Check to see if the Power and Link LEDs on the front of the server light. If not,
unplug the server and check the power supply, then check the Ethernet
connection and plug the server in again. If the LEDs still do not light, refer to
Appendix B, Troubleshooting.
2.3.1 Power-up Diagnostics
The MSS boot-up procedure consists of three steps. During normal operation, the boot process
requires approximately 30 seconds to complete.
1. The MSS runs through a set of power-up diagnostics for approximately five
seconds. The Power LED should remain solid green; the Link LED should
remain solid green for MSS1-T units; the OK and Serial LEDs should show
varying patterns corresponding to the test being run.
NOTE: The Power and Link LEDs should be solid green if the unit is plugged in and there
is a valid connection to a 10BASE-T network.
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Installation
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