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4120 Network (International)
Installing Ferrite Beads
on RS-232 Wiring
1997 Simplex Time Recorder Co.
All specifications and information shown were current as of publication, and are subject to change without notice.
574-137
Rev. A
DO NOT INSTALL ANY SIMPLEX PRODUCT THAT APPEARS
DAMAGED. Upon unpacking your Simplex product, inspect the contents of the
carton for shipping damage. If damage is apparent, immediately file a claim
with the carrier and notify Simplex.
ELECTRICAL HAZARD - Disconnect electrical power when making any
internal adjustments or repairs. Servicing should be performed by qualified
Simplex Representatives.
A 155-010 Ferrite Bead (procured separately) must be added to each RS-232
twisted-pair to reduce radiated emissions. The following procedure describes
the installation of this ferrite bead.
Note: To accomplish the following steps, you must first remove power from
the system and open the Master Controller display door.
Use Steps 1 through 4 to install the ferrite beads.
1. Loop the RS-232 twisted-pair wires including the shield (or drain) wire
through a 155-010 Ferrite Bead close to the back box knockout. (See
Figure 1, Detail A.)
2. Attach the shield wire in the following manner.
Master System: Attach the shield wire to the Ground Bar, as shown in
Figure 1.
Slave System: Attach the shield wire to the AC Ground Network (Simplex
Kit No. 742-122) with a wirenut. Then attach the AC Ground Network to
the Ground Bar.
3. Repeat this procedure for each RS-232 twisted pair. When more than two
panels are involved, the Slave System (Panel Two) becomes the Master
System for the Panel Three. (See Figure 2.)
Cautions and Warnings
Introduction
Installation
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574-137
Rev. A
*FIGURE NOTE: Add 742-122 AC Ground Network.
SEE NOTE 1
TB1
TO
TWISTED-PAIR
WIRE
FERRITE
BEAD
(A)
GROUND BAR (MASTER PANEL)
AC GROUND NETWORK (SLAVE PANEL)
Figure 1. Installing a 155-010 Ferrite Bead on RS-232 Twisted Pair
Wires
Figure 2. Attaching Shield Wires for Multiple Panel Installations
PANEL 1
PANEL 2 PANEL 3 PANEL 4
MASTER
SLAVE*
MASTER
SLAVE*
MASTER
SLAVE*
FIGURE NOTE: Mount Ferrite Bead close to back box knockout.
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