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Communication Requirements
conduit. Do not run the cable outdoors without the use of metal conduit. Do not run this cable
overhead, outdoors.
The cable can be run indoors without the use of metal conduit. The shield drain wire must be
connected to the system AC ground (at one end only).
If using cable other than that recommended previously, the RS-485 field wires must be
installed in a metal conduit separate from any AC wires.
4
Distance: The maximum field wiring cable length is not to exceed 1500 feet (455m).
RS-232
RS-232 wiring can be used for communication between the TopKAT and EIA RS-232
compatible peripheral devices (CRT/printer, modem, etc.). The remote end of the wiring can
be terminated with either an RS-232D connector or a Gasboy termination box. You must
follow these installation requirements when installing the RS-232 communication lines:
1
All peripheral equipment connected to the RS-232 ports must be UL-listed, have an
Electronics Industry Association (EIA) standard RS-232 communication protocol and not be
installed over a hazardous location.
Distance: The following distances must be adhered to when installing the RS-232
2
communication lines:
• 1 - 100 feet (1 - 31 meters): RS-232 can be directly connected to a peripheral device.
• 101 - 1500 feet (32 - 455 meters): RS-422 and Gasboy short haul modem (SHM) are
Conduit: All direct connect RS-232 cables over 15 feet (5m) must be in a metal conduit
3
separate from any AC wires. For conduit requirements of short haul modems, see the
installation sheet that applies to the device being used.
4
Cables: RS-232 cables can either be purchased from Gasboy or made by the installer. The
type of cable needed will vary according to the devices it connects. When making cables, wire
used must be stranded, not solid core.
MDE-4319A TopKAT Fuel Managment System Installation Manual · November 2005
required. See
"RS-422 - Short Haul Modems" on page
General Installation
20.
Page 19
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