Honeywell ACS-2plus - 6 Interface and Bus Topology; Interface Technology, RS485 Bus Systems; Principle; General Information

Installation instructions / ACS-2 plus 15
6. Interface and bus topology
6.1 Interface technology, RS485 bus systems
There are two types of data transmission, point-to-point connection and multipoint connection.
Point-to-point connection means that two controllers are communicating with each other. A point-to-point
connection can be realized by means of an RS232 and a current loop interface.
Multipoint connection means that several controllers are communicating with each other. The RS485 interface
corresponds to a multipoint connection.
A bus topology is used for the RS485- interface.
6.1.1 Principle:
6.1.2 General information
The RS485 interface used is a bidirectional interface with bus capability. Up to 32 users can be connected which
can be transmitters as well as receivers. The line ends are provided with a terminating resistor.
The terminating resistors can be set on the interface by means of jumpers.