Simplex 2050 Series User Manual

6.4 The RS485 interface
Use the RS485 interface to connect annunciators.
Figure 13: RS485
6.4.1 Wiring annunciators
To wire an annuciator, complete the following steps:
• All wiring is between 18 AWG minimum and 12 AWG maximum.
• All wiring is supervised and power limited.
• Check that all conductors must test free of all grounds and stray voltages before you connect the annunciator to the unit.
• For bus style wiring, the maximum wiring limit is 4,000 feet. For bus style wiring, see Figure 14.
• For T-Tap style wiring, the maximum distance to the furthest device is 2,500 feet. For T-Tap style wiring see Figure 15.
• The maximum wiring capacitance is 0.58 μF.
• Attach 0733-974 (100 ohm, 1/2 W) resistor A as shown in Figure 14 and Figure 15 for the line matching.
• Refer to the remote annunciator's instructions for more details.
• Annunciator wiring of RS485 needs to be in class B only.
• Annunciator model compatible with 2250-9101 and 2050-9101 model is 2606-9101.
page 24 579-1404 Rev A
2050 and 2250 Foundation Series Fire Alarm Control Units Installation Guide

Simplex 2050 Series Specifications

General

Brand	Simplex
Model	2050 Series
Category	Control Unit
Language	English