Gasboy TopKAT Fuel Management System Installation - Manual (Page 25)

MDE-4319E TopKAT™ Fuel Management System Installation Manual · August 2008 Page 19
Communication Requirements General Installation
Communication Requirements
The TopKAT system utilizes RS-485, RS-232, and RS-422 modes of communication for
communicating to the ASTRA, 9800, Mechanical PCUs and peripheral equipment. The
TopKAT has three ports:
• Port 1 is an RS-485 port that is dedicated to communicate with the ASTRA or satellite
TopKAT system.
• Ports 2 and 3 are configurable for either an RS-232 or RS-422 for communication with a
data terminal, modem, or PC.
Phone line (modem) communication may also be used when remote communication to the site
is desired. If a TopKAT internal modem is used, Port 3 is not available for external
communication wiring. The specific requirements for each of these modes of communication
are listed below.
RS-485 - ASTRA and Mechanical PCUs
RS-485 wiring is used for communication between the TopKAT system, ASTRA, and
Mechanical PCUs. This communication takes place over the RS-485 wiring that is supplied
with the TopKAT when the TopKAT system is mounted on an ASTRA or the Mechanical
PCU is mounted in the TopKAT pedestal.
RS-485 - Master/Satellite Option
The master/satellite option uses four wires to operate a full-duplex RS-485 communication
loop. Ports 2 and 3 of the master can be set for either RS-232 or RS-422 communications to a
data terminal or computer or used to communicate with an optional built-in modem.
• All wiring is to be installed and used in accordance with all building/fire codes, Federal,
State and Local codes, National Electrical Code (NFPA 70), NFPA 30, and Automotive
and Marine Service Station Code (NFPA 30A) codes and regulations. Wiring must also
conform to the wiring diagram supplied with the pump/remote dispenser. Canadian users
must comply with the Canadian Electrical Code.
• Power: The AC power for the short haul modem should come from the same breaker that
supplies the peripheral device or the system (Micro Feed).
• Cable: A twisted-pair shielded cable is highly recommended for RS-485 wiring. Although
it is recommended that wires be run in a conduit away from AC wires, they can be
combined in the same conduit with AC wires, provided that a UL-listed cable with the
following specifications is used:
- Conductor: 18 AWG stranded wire; one twisted-pair
- Shield: Foil-wrapped 100% coverage and/or tinned copper braid 90% coverage
- Drain Wire: Stranded, tinned copper, 20 AWG or larger/or braided shield
- Voltage Rating: Maximum operating voltage of 600 V
- Environmental: Gas and oil-resistant; suitable for wet or dry locations.
Gasboy can supply Belden ® 1120A (part number C09672) that is a UL-listed, 2-conductor
cable that meets the requirements listed above.
Belden 1120A is UL-listed but not CSA-listed.
Cables with a voltage rating of less than 600 V must be installed in a conduit away from
all AC wires.