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5 INSTALLATION
5.1 GENERAL RS-485 BUS INSTALLATION
EKB 500 uses an RS-485 simplex wiring; the signal is transferred via a single twisted pair line.
CAT5 network cable is recommended, UTP version (unshielded) is sufficient for normal application. A
shielded cable should be used if the installed cables are expected to be highly susceptible to
interferences.
The number of devices installed in one bus is limited to 32 (expandable through signal distributors), while
max. 8 EKB 500 keyboards may be installed in one system.
Basically, the bus should be created by serial wiring.
Maximum RS-485 bus cable length is 1200 m.
Maximum cable length from box to device is 2m using connector boxes.
Star wiring is permitted only with signal distributors.
WRONG !
RS-485 signal distributors may be used for star wiring. The maximum system cable length can also be
expanded by using these distributors, physically providing a new RS-485 bus with 1200 m cable length
each at every distributor output.
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EKB500_ma_en_rev1.5_3.doc
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