Gasboy CFN Series Site Controller III - Manual (Page 44)

System Components Wiring Phone Modems
Page 40 MDE-4298D CFN Series Site Controller III Installation Manual · September 2009
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 in
“Short Haul Modem (SHM) RS-422” on page 39 , RS-422 wires can be run with AC wires
in a 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 when
outdoors.
The cable can be run indoors without the use of a metal conduit. The shield drain wire
must be connected to the system AC ground.
If you are using a cable other than the one recommended previously, the RS-422 field
wires must be installed in a metal conduit separate from any AC wires. This cable must
also meet the other previously specified requirements.
• Distance: The maximum field wiring cable length must not exceed 1500 feet.
Phone Modems
The type of phone line required for remote communication using a modem depends on the
type of modem used and the method of communication preferred. Consult the manual
provided with the modem for specific requirements.
Wiring for a Tank Monitoring System
The following diagrams show the wiring schemes when connecting the SC to a Tank
Monitoring System. All wiring must be installed according to the RS-232 and RS-485 wiring
specifications described in
“Communication Requirements” on page 33 . Consult the
manufacturer’s documentation for installation instructions before connecting a tank gauge to
your CFN system. For EECO monitors, use a C07476 Cable in place of the C04549 Cable.
Figure 4-8: Wiring for a Tank Monitoring System (8 feet or less)