Gasboy CFN Series Site Controller III - Manual (Page 43)

MDE-4298D CFN Series Site Controller III Installation Manual · September 2009 Page 39
Short Haul Modem (SHM) RS-422 System Components Wiring
Short Haul Modem (SHM) RS-422
A Gasboy SHM 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 SHM is
required at each end of the communication line.
Figure 4-7: SHM Connections
• All wiring must 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 (NFPA 30A) codes and regulations. Wiring must
conform to the wiring diagram supplied with the pump/remote dispenser also. Canadian
users must also comply with the Canadian Electrical Code.
• Power: The AC power for the SHM 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 if a 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 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.
If a cable with a voltage rating of less than 600 V is used, it must be installed in a conduit
away from all AC wires.