Moxa EDS-308-S-SC [13/17] Attention

- 13 -

suggest labeling the two sides of the same line with the same letter

(A-to-A and B-to-B, as shown below, or A1-to-A2 and B1-to-B2).

SC-Port Pinouts

SC-Port to SC-Port Cable Wiring

ST-Port Pinouts

ST-Port to ST-Port Cable Wiring

ATTENTION

This is a Class 1 Laser/LED product. To avoid causing serious

damage to your eyes, do not stare directly into the Laser Beam.

Redundant Power Inputs

Both power inputs can be connected simultaneously to live DC power

sources. If one power source fails, the other live source acts as a backup,

and automatically supplies all of EDS-308/309’s power needs.

Alarm Contact

The Moxa EtherDevice Switch has one Alarm Contact located on the top

panel. For detailed instructions on how to connect the Alarm Contact

power wires to the two middle contacts of the 6-contact terminal block

connector, see the Wiring the Alarm Contact section on page 8. A typical

scenario would be to connect the Fault circuit to a warning light located in

the control room. The light can be set up to switch on when a fault is

detected.

The Alarm Contact has two terminals that form a Fault circuit for

connecting to an alarm system. The two wires attached to the Fault

contacts form an open circuit when (1) EDS has lost power from one of

the DC power inputs, or (2) one of the ports for which the corresponding

PORT ALARM DIP Switch is set to ON is not properly connected.

If neither of these two conditions occurs, the Fault circuit will be closed.