Honeywell ACS-8, Installation Instructions Manual

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Installation Instructions / ACS-8 45
8.2 Connection via the optional communication module (026587)
The number of doors controlled can be increased to eight by using the optional communication module 026587
and the RS 485 bus technology
The following modules are available:
Device Item no.
4I/2O-module (4 inputs, 2 outputs, for door control) 26592
Door module (for the control of one door,
connection of 2 clock/data readers and 2 2-wire
keypads) 265931002659410
4-I-module (4 inputs, for building management
system) 26590
4-O-module (4 outputs, for building management
system) 26591
Potential separation module 2659510
Readers / keypads see latest product catalogue
8.2.1 Overview
The communication module has two floating RS 485 interfaces.
The 4I, 4O, 4I/2O modules each have floating RS 485 interfaces.
The reader, keypad and the door modules are not floating. If potential separation is required, up to 4 of these
modules can be connected to the RS 485 bus using the potential separation module
There are two possible connection arrangements:
1. Using power supplied from the ACS-8
-
All modules are supplied with power from the ACS-8.
- No potential separation is required.
- The distance limitations for RS 485 are dependent on the voltage drop on the 12V supply lines.
(All 12V modules have an operating voltage range of 10-15V DC).
2. Decentralized power supply from more than one external power supply units distributed throughout the
system.
-
If problems should appear with the data transmission to the ACS-8, a potential isolator (POT)
should be used.