TR-Electronic 65 Serie Montageanleitung Seite 131

4.2.1 Cable definition
Signal
Data+ / Data–
(RS422+ / RS422–)
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
approx. 6ns must be calculated.
SSI clock frequency [kHz]
Line length [m]
A shielded data cable must be used to achieve high electromagnetic interference
stability. The shielding should be connected with low resistance to protective ground
using large shield clips at both ends. Only if the machine ground is heavily
contaminated with interference towards the control cabinet ground the shield should
be grounded in the control cabinet only.
It is also important that the data- and clock-lines are routed separate from power
current carrying cables if at all possible.
The applicable standards and guidelines are to be observed to insure safe and stable
operation!
In particular, the applicable EMC directive and the shielding and grounding guidelines
must be observed!
Printed in the Federal Republic of Germany
04/25/2022
Line
2
min. 0,25mm , twisted in pairs and shielded
810 750 570
approx. 12.5 approx. 25 approx. 50
TR-ECE-BA-DGB-0063 v15
(Data+/Data–) of
D
360 220 120
approx. 100 approx. 200 approx. 400 approx. 500
 TR-Electronic GmbH 2007, All Rights Reserved
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