Sharp JW-20CM User Manual

Page 54

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8

·

16

From the previous page

Set STA. NO. (station number) switch

· Set "STA. NO" (station number) in octal

notation in sequential numbers from 01 to 77.

Be careful that there is no doubled setting or

l a c k e d n u m b e r s e t t i n g . ( N u m b e r o f

connectable slave stations: See page 8·2)

Set LT (termination resistance) switch

• When a JW-20RS slave module is at either

end the communication line, make sure to

set the termination resistance switch "ON."

Reference: Function of the termination resistance switch

If the communication line does not have a termination resistance, the high frequency signal will

be reflected at the ends of the cable. These reflected signals can collide with the original

communication signals, so that some stations will not be able to communicate normally. The

use of termination resistance suppresses reflected signals. If the termination resistance switch

on any of the stations in between the end of the cable is turned ON, the station will generate a

reflection wave signal or attenuate the original signal and may not communicate normally.

· When the trunk line has a branch in it, turn ON the termination resistance at the station on the

trunk cable.

· If you use a terminator (termination resistance made by Toko Denshi: ME-75) at the end of a

signal cable, turn OFF the termination resistance at the station on the end of the cable.

To the next page

Turn ON the termination resistance

switches on these two stations.

Trunk cable

"T" branch

Termination
resistance (ON)

Drop cable
(branch line should
be less than 400 mm)

Terminator

Terminator

Less than 1 km

Terminator: ME-75

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