WARNING
YOUR RFL 9300 TERMINAL MAY BE EQUIPPED WITH FIBER OPTIC
INPUT/OUTPUT MODULES THAT HAVE FIBER OPTIC EMITTER HEADS. FIBER
OPTIC EMITTER HEADS USE A LASER LIGHT SOURCE THAT PRODUCE
INVISIBLE RADIATION. FIBER OPTIC COMMUNICATION SYSTEMS ARE
INHERENTLY SAFE IN NORMAL OPERATION BECAUSE ALL RADIATION IS
CONTAINED IN THE SYSTEM. IT IS POSSIBLE DURING MAINTENANCE TO
EXPOSE THE RADIATION BY REMOVING OR BREAKING THE FIBER.
STARING DIRECTLY INTO THE LIGHT BEAM MAY RESULT IN PERMANENT
EYE DAMAGE AND/OR BLINDNESS. NEVER LOOK DIRECTLY INTO THE
LIGHT BEAM AND BE CAREFUL NOT TO SHINE THE LIGHT AGAINST ANY
REFLECTIVE SURFACE.
THE LASER SOURCE IS A CLASS I LASER PRODUCT WHICH COMPLIES
WITH APPLICABLE FDA, OSHA AND ANSI STANDARDS.
5.7 FIBER OPTIC CONNECTIONS
If your RFL 9300 is equipped with fiber optic modules, fiber optic pigtails must be connected to the fiber optic
I/O modules at the rear of the chassis. Amphenol 906 Series fiber optic connectors (or their equivalent) are
used with multimode fibers; Type ST connectors are used with singlemode fibers. The exact connector used
will depend upon the fiber optic I/O modules that are installed in the RFL 9300, and the specific optic cable be-
ing used.
When connecting the fiber optic pigtails, make sure the connectors are properly aligned before tightening, and
then fully tighten them. This will help minimize losses in the connector.
5.8 DIRECT DIGITAL CONNECTIONS
RFL 9300's equipped with one or more RFL 93 DD Direct Digital I/O Modules require shielded cables with a
metallic DC-37 connector shell (37-pin D-subminiature). The shield ground (chassis ground) should be con-
nected on both the RFL 9300 and on the digital communications equipment (DCE). A solid ground bus connec-
tion must be provided at the RFL 9300 and the DCE that is independent of the shield ground connection
.
High ground currents could damage the shield or disturb communications if a bus ground is not provided. The
RFL 9300 and the DCE must be close to each other and on the ground mat; isolation must be established in
the DCE-to-DCE interface. The cable should be of a multi-pair type rated for RS-422 communication, and must
have both a foil and braided ground shield. The braided ground must connect to the metal case of the DC-37
connector and the chassis bus ground. An example of this type of cable is Belden Type 8165; this cable pro-
vides an overall shield plus a shield on each individual pair.
Pin assignments for the DC-37 connector are shown in Table 5-1.
5.9 IRIG-B CLOCK CONNECTIONS
IRIG-B signals are used to synchronize the internal real time clock of the RFL 9300 so that alarm events and
trip events can be accurately time stamped. The IRIG-B clock source is connected to the rear panel of the RFL
9300. The IRIG-B signal enters the 9300 via a BNC connector on the Relay I/O module as shown in Figure 5-3.
RFL 9300 RFL Electronics Inc.
October 20, 2004 5-11 (973) 334-3100
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