Gasboy CFN Islander II - Manual (Page 31)

CFN Series System
3-4 03/07/03
RS-232
RS-232 wiring can be used for communication between the CFN Islander and EIA RS-232
compatible peripheral devices (CRT/printer, modem, etc.). The remote end of the wiring can be
terminated with either an RS-232D connector or a GASBOY termination box. You must follow
these installation requirements when installing the CFN RS-232 communication lines:
1. All peripheral equipment connected to the RS-232 ports must be UL-listed, have an
Electronics Industry Association (EIA) standard RS-232 communication protocol and not be
installed over a hazardous location.
2.
Distance: The following distances must be adhered to when installing the RS-232
communication lines:
● 1 - 100 feet: RS-232 can be directly connected to a peripheral device.
● 101 - 1500 feet: RS-422 and GASBOY short haul modems (SHM) are required. See Short
Haul Modems later in this section.
3.
Conduit: All direct connect RS-232 cables over 15 feet must be in a metal conduit separate
from any AC wires. For conduit requirements of short haul modems, see the installation
sheet that applies to the device being used.
4.
Cables: RS-232 cables can either be purchased from GASBOY or made by the installer.
The type of cable needed will vary according to the devices it connects. When making
cables, wire used must be stranded, not solid core and may be 18 to 22 gauge.
RS-422
For guidelines and restrictions on RS-422 wiring, see Short Haul Modems (RS-422) later in this
section.