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Control Panel Description and Installation

150964 4-15

4.13 SBUS

Most modules available for use with the 4821/4820 connect via a four-wire serial bus (SBUS).

There are two SBUS connections that are referred to in this manual as “SBUS1” and

“SBUS2”.

Each SBUS is a four-wire serial bus containing two power and two data conductors. The

power conductors are identified as S- (system ground) and S+ (+10 to +14 volts). The data

conductors are identified as A and B. Lines A and B are a differential RS485 pair.

All modules connected on the SBUS can be located as far as 4,000 feet from the control panel,

if sufficiently large wire gauges are used for the power and ground connections. The voltage

drop on the wire run must not be more than 2.0 volts. (See Section 4.13.3 for specifics.)

Figure 4-9 is a general picture of SBUS connection points. Wiring for each SBUS module is

shown in the appropriate section of this manual or in the separate manual for the device.

Figure 4-9 SBUS Connection Points

4.13.1 SBUS Modules

The following modules connect to the 4821/4820 via the SBUS:

• Touchpads (Models 4421, 4860C, 4860R, and 4860Rx)

Note: 4421 cannot be used with the 4820 control panel

• Zone Expanders (Models 4815 and 4825)

• Status Output Module (Model 4880N-750-SDB)

• Serial/Parallel Module (Model 4824)

Figure 4-10 shows an installation making use of all SBUS modules available with the Model

4821/4820 system. (For simplicity, the diagram shows all modules connected to a single

SBUS, though in a real application you would typically divide modules as evenly as possible

between SBUS1 and SBUS2.)

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SILENT KNIGHT 4821 Installationshandbuch Seite 59