Gasboy 1000 Series Technical Reference Manual - Manual (Page 140)

GASBOY Series 1000
6-2 03/07/03
DATA TERMINAL AND EXTERNAL MODEM WIRING
RS-232 Communication (For Distances to 100 Feet)
Devices RS-232 wiring can be used for direct connection to an EIA RS-232 compatible
peripheral device (e.g., data terminal, external modem). The distance of the RS-
232 cable is limited to 100 feet and must be in metal conduit separate from any
AC wires. The system end of the cable is wired directly to a terminal block. The
remote end of the wire can be terminated with either a RS-232 D connector
(Figure 6-1) or a GASBOY RS-232 termination box. (P/N C05769) (Figure 6-2).
Cables and
Connectors
RS-232 wiring diagrams are illustrated on the next page. GASBOY part numbers
for the necessary cables and connectors are indicated. In the diagram, Port 1 is
shown connected to a data terminal and Port 2 is connected to an external
modem.
RS-422 Communication (For Distances to 1500 Feet)
Short Haul
Modem
RS-422 wiring requires the use of a GASBOY Short Haul Modem (P/N C05618)
and the appropriate cable for connection to an RS-232 data terminal, external
modem, etc. The short haul modem is located next to the RS-232 device and
converts the RS-422 signal from the system to an RS-232 signal and vice versa.
RS-422 wiring is capable of running up to 1500 feet. Other advantages of RS-
422 are its high noise immunity and exceptions allowed to normal conduit
requirements as outlined below.
Installation
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.
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.