InfiniSource ETC 100, Hardware Manual

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TimeForce II Hardware Guide 207
Cable Specifications
Cable Specifications
Serial Clocks
In order to ensure proper clock operation, the cable between the com-
puter and the clock and the cable between clocks must meet certain
specifications, and also must be correctly pinned out to the computer’s
serial port.
• The cable between the computer and the Master Serial time clock
must not exceed 200 feet in length.
• The total length of the cable from the Master to the last Daisy clock
must not exceed 4000 feet in length.
• Any cable over 20 feet in length should be shielded, and should not
have any splices. It is recommended that you use shielded cable
supplied by Infinisource. If you are unable to use cable supplied by
Infinisource, category 3 or 5 Shielded Twisted Pair cable may be
used, but you should only use 1 wire from each twisted pair, and
abandon the other wire of each pair. For example, you could use the
blue, brown and orange solid-colored wires, and leave the blue/
white, brown/white and orange/white wires unconnected on each
end. Performance will be reduced (you may not be able to achieve
reliable daisy communications all the way to 4000 feet), but for
shorter distances performance should be adequate.
• The PC Connector is a standard DB-9 female serial connector.
• The Connector to the Master port labeled “Phone/Computer/Daisy”
must be RJ-12 (6 Pin).
• The connector from the Master to Daisy or Daisy to Daisy can be
either an RJ-11 or RJ-12, but only 4 contacts are
required . The
cable must only contain 4 wires ( not 6).
• If you have a 25-pin serial port you can either use a DB25 to DB9
serial adapter (
recommended ), or build your own cable using a
DB25 connector. Contact Infinisource Technical Support for a
pinout diagram.