SilentKnight SK-F485C User Manual

SK-F485C Fiber to SBUS
Converter Installation Instructions

The SK-F485C offers a seamless
conversion from panel SBUS connection to
fiber and back again.

Note: Product is not to be used to network FACP’s.
Note: Primary power, SBUS, and SLC circuits are supervised

and power limited. Fiber optic circuits are supervised.

Compatibility

The SK-F485C is compatible with the
following Silent Knight F ACPs and power
supplies:

• IFP-50 / 5700

• IFP-100 / 5808

• IFP-1000 / 5820XL

• IFP-2000 / RPS-2000

• IFP-2000VIP

• IFP-100ECS

• IFP-1000ECS

• 5895XL

• RPS-1000

• 5496

Mounting

You can mount the SK-F485C in a
compatible FACP cabinet.

Figure 2: SK-F485C Mounting in FACP Cabinet

Mounting using 5815RMK

The 5815RMK is a remote mounting kit that
lets you install up to two SK-F485C
converter modules in a single cabinet.

Note: When using a 5815RMK, you must mount it within 20’ of

the control panel or power supply in conduit.

To mount the SK-F485C:

1. Remove AC power and disconnect the
backup batteries from the main control

2. Mount the SK-F485C in an FACP or
power supply using the 1/4” standoff
provided and secure with screws
provided. See Figure 1 and Figure 2.

Note: When the SK-F485C is used with IFP-100/5808 or IFP-

50/5700, you must use the 5815RMK cabinet.

Figure 1: 1/4” Standoff and Screw

Figure 3: SK-F485C mounting using 5815RMK

P/N LS10004-001SK-E Rev A

ECN: 12-0089

SK-F485C Fiber to SBUS Converter Installation Instructions

Wiring

See Table 1 and Figure 4 to wire a SK­F485C to a compatible FACP.

Table 1: SK-F485C to FACP Connections

SK-F485C Terminals FACP SBUS Out Terminals

++
––
AA
BB

SK-F485C to Power Supply
Connection

See Table 3 and Figure 5 for terminal
connections for SK-F485C to the 5895XL or
RPS-1000.

Table 3: SK-F485C to Power Supply Connection

SK-F485C
T erminals

+32
–33
A31
B30

Power Supply

Ter minal Numb er

22 32
23 33

Figure 4: SK-F485C connection to the panel

SK-F485C to SK-F485C Connection

See Table 2 for terminal connections for SK­F485C to the SK-F485C.

Ta ble 2: SK-F485C to SK-F485C Connection

SK-F485C
Terminals

RX TX
TX RX

SK-F485C
Terminals

Figure 5: SK-F485C to power supply terminal

connection

2 PN LS10004-001SK-E Rev A

SK-F485C Fiber to SBUS Converter Installation Instructions

Panel to Power Supply Fiber
Connection

Figure 6: Connecting fiber from panel to power supply

Specifications

• External Power Supply: 9-35VDC @ 125
mA max

• Fiber Connection Duplex ST connectors
for Tx and Rx Data Fiber Cable Duplex

62.5 micron Multimode Fiber Data Rate

115.2K bits/second

• Fiber Distance Up to 1.0 Mile (1.6Km)
SK-F485C Connection (two-wire) or Ter­minal strip, and jumper selectable bias /
termination

Note: There are several jumpers on the board. These jumpers

need to remain in place.

• Maximum attenuation 5.5db

• SK-F485C Cable, single twisted pair,
24AWG, Helix 21011.

• SK-F485C Data Direction Control Auto­matic half duplex transmitter enable con­trol, for any baud rate / data bits

• Operating Temp: 32° - 120°F (0-49°C)

• Humidity: 10%-93% (non-condensing)

• Dimensions: 4.75” x 4.25” x 1.0”

3 PN LS10004-001SK-E Rev A