Installation / Preparation for commissioning
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Printed in the Federal Republic of Germany
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TR - ECE - BA - DGB - 0104 - 07
11/07/2018
4.2.3 Cable definition
Signal
Data+ / Data–
(RS422+ / RS422–)
min. 0,25 mm
2
, twisted in pairs and shielded
Clock+ / Clock–
(RS422+ / RS422–)
The maximum cable length depends on the SSI clock frequency and cable quality and
should be conditioned to the following diagram.
Pay attention, that per meter cable with an additional delay-time t
D
(Data+/Data–) of
approx. 6 ns must be calculated.
SSI clock frequency [kHz]
810
750
570
360
220
120
100
Line length [m]
approx. 12.5 approx. 25
approx. 50
approx. 100 approx. 200 approx. 400 approx. 500
