Gasboy 1000 Series Fuel Management System Installation - Manual (Page 62)

Communication Wiring Short Haul Modem - RS-422
Page 58 MDE-4344A Series 1000 Fuel Management System Installation Manual · November 2008
Short Haul Modem - RS-422
A Gasboy Short Haul Modem and the appropriate interconnect cable must be used when the
RS-422 communication mode is being used. It should be used for distances between 100 and
1500 feet. It can be used for distances under 100 feet in place of RS-232 wiring. One Short
Haul Modem is required at the remote end of the communication wiring. Refer to
“Field
Wiring Schemes for Ports 1 and 2” on page 54 for wiring diagrams.
Installation Requirements
• All wiring is to be installed and used in accordance with all building/fire codes, all
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/dispenser. Canadian
users must also 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.
• Cable: Twisted pair shielded cable is highly recommended for RS-422 wiring. Although it
is recommended that wires be run in a conduit separate from AC wires, they can be
combined in the same conduit with AC wires providing UL-listed cable with the following
specifications is used:
Specification Description
Conductor 18 AWG stranded wire. 2 twisted-pairs
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 1063A (Part Number C09655) which is a UL-listed, 4-
conductor cable that meets the requirements listed above.
Note: Belden 1063A is UL-listed but not CSA-listed.
Cable with a voltage rating of less than 600V must be installed in a conduit separate from
all AC wires. These modems must be connected with private lines and will not work if
connected into a telephone network.
• Conduit: When using the recommended shielded twisted-pair cable described above, RS-
422 wires can be run with AC wires in metal conduit. The shield drain wire must be
connected to the system AC ground. Only AC wires for the system and pumps can be
installed in the AC 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. If using cable other than that recommended above, the RS-422 field wires must be
installed in a metal conduit separate from any AC wires.
• Distance: The maximum field wiring cable length is not to exceed 1500 feet.