s88 Repeater
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2. Operation overview and connections
Info: Standard s88-N
The standard s88-N regulates the assignment of commercial Ethernet patch-cables for use in
s88 feedback systems. Unlike the 6-conductor connecting cables frequently used, the patch-
cables used in computer networks are screened against outside electric signals. Thus using
patch-cables reduces the liability to interference considerably.
Mode of operation
When using screened patch-cables with RJ-45 connections in s88 bus systems corresponding
to the standard s88-N even laying long data lines do not pick up interference. With
transmission paths of more than 30 m, however, the datasignal´s edges smooth down and
get round – as in all bus systems. This can result in faulty messages due to singular bits so to
speak "getting lost" during data transfer and thus the bits´ sequence being shifted.
The s88-repeaters should be mounted on the s88-data line at distances of approx. 20 m. They
post-process the signals so that a correct data signal with angular edges is provided at their
outputs.
Mounting the s88-Repeater
Mount the s88-repeater at a distance of approx. 20 m from the control unit or the s88-
interface into the data line, measured over all cables connecting the control unit or the
interface and all s88-feedback modules for the concerned data line. If necessary, mount
additional s88-repeaters into the data line at distances of 20 m each.
Connect the s88-repeater via the RJ-45-connections to the data cables. The end marked with
"Zentrale" on it´s bottom should point in the direction of the digital control unit / the
interface.
4 | Operation overview and connections
Summary of Contents for s88
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