Gasboy CFN Islander II - Manual (Page 39)

CFN Series System
3-12 03/07/03
SHORT HAUL MODEMS (RS-422)
A GASBOY short haul modem and the appropriate interconnect cable must be used when the RS-
422 communication mode is being used to communicate to one of the ports of the CFN Islander.
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 SHM is required at the remote end of the communication
wiring. See Port Communication Wiring earlier in this section for local and remote wiring
diagrams.
Installation Requirements
1. 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/remote dispenser. Canadian users must also
comply with the Canadian Electrical Code.
2.
Power: The AC power for the short haul modem should come from the same breaker that
supplies the peripheral device or the system.
3.
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:
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 600V
Environmental: Gas- and oil-resistant; suitable for wet or dry locations.
GASBOY can supply Belden 1063A (P/N 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.
4.
Conduit: When using the recommended shielded twisted-pair cable described previously,
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 previously, the RS-422 field wires must be
installed in a metal conduit separate from any AC wires.
5.
Distance: The maximum field wiring cable length is not to exceed 1500 feet.