User`s manual

170 INT 120 00

Status of the

slide switch

The slide switch determines whether the bus adapter is the last node at the remote

bus.

Function of the

TST button

The quality of the line can be verified with the TST button without using an additional

measuring device. If the INTERBUS is already installed, just press the button. The

incoming light quantity is then captured and qualitatively assessed.

Result of evaluation on pressing the TST button

Causes of line

faults

Causes for the illumination of the WR or WG LEDs on pressing the TEST button and

their possible solutions:

Status Meaning

NEXT More nodes follow

END Bus adapter is the last node.

Status of WR and WG LEDs Meaning

Both LEDs off The incoming light quantity amounts to at least -

22 dBm

At least 1 LED on The light reserve is at critical limit, see section "Causes

of line faults, p. 94".

Causes Solution

Transmission distance too long select another type or use a repeater

Bending radius too small select a larger radius

Quality of connector plug:

Lens dirty

End of fiber scratched

Clean lens

Cut end of fiber

Fiber broken Replace optic fiber