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90
Overview of the LNL-8000 Board
The Star Multiplexer was designed to implement star topology on a single downstream port (ports 2 through
5) of the Intelligent System Controller, to eight RS-485 (2-wire) ports or four RS-485 (4-wire) channels. The
Star Multiplexer requires 12 VDC for power. It allows conversion of communication protocol, and provides
connection with alternate communication devices to extend effective distance.
90.1
Interfaces
The master or host interface can be either RS-232 or RS-485 (2-wire) communication. The Star Multiplexer
interfaces upstream with the Intelligent System Controller, and downstream with one or many RS-485
products (Input Control Module, Output Control Module, Single Reader Interface Module, Dual Reader
Interface Module) on each downstream port (ports 2-9). A maximum of eight (8) devices are allowed per
port.
Intelligent System Controller
(Up to 32 downstream devices)
5
Communications Overview
4
3
2
RS-232 or RS-485
2-wire communication
Star Multiplexer
2
3
Single Reader
Interface Module
0 1
2 3
4 5
6 7
8 9
*
#
RS-485 Devices
(maximum: 8 per port)
Hardware Installation Guide
1
Up to 4
Multiplexers
1
4
5
6
7 8 9
Dual Reader
Interface Module
0 1
2 3
0 1
4 5
2 3
6 7
4 5
8 9
6 7
*
#
8 9
*
#
453
revision 7 —
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