Fire-Lite Alarms MS-9200 Programming, Installation, Maintenance And Operating Instruction Manual page 51

Optional Modules
FIGURE 2-32:
Supervised and Power-limited EIA-485 and power connections.
Surge protection can be provided by using one of the UL listed compatible surge
suppressors listed in the Fire•Lite Device Compatibility Document.
+24 VDC
Nonresettable
Power (TB4)
RTM-8F
MS-9200
Notes:
This arrangement allows use of the UDACT-F simultaneously with the RTM-8F module.
1.
Ferrite cores (P/N FBD-1) are recommended for all applications.
2.
Recommended wire is 12 AWG to 18 AWG (0.75 to 3.25 mm
3.
If shielded wire is used, connect only one end of the shield:
4.
shield may be connected to cabinet (earth ground) at fire alarm panel, or
shield may be connected to TB1 Terminal 5 (shield) at UDACT-F. Note that the shield end that is not
connected should be insulated to prevent accidental grounding. Do not connect both ends of shield
under any circumstances since a ground fault may result.
Conduit is recommended for external wire runs (consult local building codes).
5.
Connect ground strap (supplied with ABS-8RF enclosure) from Earth Ground terminal on the UDACT-F to a
6.
solid building earth ground. Conduit alone will not provide a reliable earth ground.
UDACT-F may be located up to 6,000 feet (1,800 m) away from the host control panel.
7.
Refer to "Specifications" on page 9 for power requirements.
8.
UDACT-F TB1 Terminals 6 and 7 are for future use. Make no connections to these terminals.
9.
48
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External UDACT-F Mounting in ABS-8RF
Ferrite
Cores
P/N FBD-1
Install 120 ohm EOL
resistor (P/N 71244) on
TB1 Terminals 3 & 4, if
last or only device on
EIA-485 line.
MS-9200 Cabinet
firealarmresources.com
Shield
UDACT-F in ABS-8RF
(shown with cover removed)
2
) twisted, shielded pair.
Document #15668 Rev.I 04/20/98 P/N 15668:I
Solid Earth
Ground
Connection
To Phone
Lines
(supervised)
Future
Use