Fiber Options S711D Instrukcja obsługi - Strona 10

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RS485 APPLICATION NOTES

C. Data IN LED should be OFF, since there is no input

copper connection made.

D. Level /Loss should be green to off (but not red), indi-

cating that sufficient optical power is being received.

After the test has been performed at one end, swap switch

positions and connectors to perform the test on the other

end. Having done this, you have proven that the copper-

in-to-fiber-to-copper-out conversion is working in both

directions.

LED OPERATION

The S711D has 4 LED indicators that are very useful in

describing the current state of operation, as well as the cur-

rent status of data flow and fiber optic signal strength.

These indicators are LEVEL/LOSS

OUT, and ENABLED. They function as follows:

LEVEL/LOSS

: This LED is useful for indicating the rela-

tive optical signal strength at the fiber optic receiver. When

sufficient optical power is being received, the LED shines

green. As the optical power is decreased, as happens

through long fiber runs, splices, or connections, the inten-

sity of the LEVEL/LOSS

of the S711D's sensitivity range has been reached. At this

point the LED will appear OFF. If any additional optical

attenuation is introduced, the LEVEL/LOSS

bright RED, indicating an insufficient amount of optical

CONTINUED

, DATA IN, DATA

LED will diminish until the limit

LED will turn

power is being received. All data will default to it's failure

state level to eliminate bus contention.

DATA IN: The DATA IN LED indicates the level of the data

being input to the S711D over copper. A GREEN LED indi-

cates a logic HIGH is present on the copper inputs. A YEL-

LOW indication indicates a logic LOW is present on the

copper. No color (OFF) indicates a tri-state or high imped-

ance input. This can therefore be used to determine the

resting state of your equipment and, in the RS485 states,

verify that a tri-state is being detected properly. Unlike

most competing units, the S711D has special circuitry to

capture data transitions and make them visible on the

LEDs.

High-speed bursts of activity, previously unde-

tectable by standard LED circuits, can easily be seen by

this special circuitry.

DATA OUT: The DATA OUT LED functions identically to

the DATA IN LED except that the LED represents data that

is being output from the unit. This LED has the same high-

speed capture circuitry described in the DATA IN section.

ENABLED: This LED has three states. GREEN, to indi-

cate a valid mode has been selected, RED to indicate an

invalid mode (spare or test-mode) has been selected, or

FLASHING RED/GREEN to indicate that NO mode has

been selected.

Table 20 provides a convenient summary of the LED dis-

play functions.

S711D & S7711D Instruction Manual