Moxa Technologies EDS-405A Installation Guide download pdf (Page 12)

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Remember to connect the Tx (transmit) port of device I to the Rx (receive)

port of device II, and the Rx (receive) port of device I to the Tx (transmit)

port of device II. If you make your own cable, we 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 the EDS-405A/408A with power.

Relay Contact

The Moxa EtherDevice switch has one relay contact located on the top

panel. For detailed instructions on how to connect the relay contact power

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

connector, see the Wiring the Relay Contact section. 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 relay 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) a relay warning event is triggered, (2) the

EDS-405A/408A is the Master of this Turbo Ring, and the Turbo Ring is

broken, or (3) there is a start-up failure. If none of these three conditions

occur, the fault circuit will be closed.

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Moxa Technologies EDS-405A Installation Guide Page 12