Connecting Addressable Dl20 Masters - Allen-Bradley A-B QUALITY DL20 Series User Manual

Chapter 9
Installation and Maintenance
Host PLC or
computer serial
RS-422 OUT
port.
9–10

Connecting Addressable DL20 Masters

Connect up to 32 individually addressable DL20s to an RS-422 port of a
PLC or computer. The connection is made using a 100% shielded twisted
pair cable with drain wire.
All DL20s must have their RS-422 port set for input, and their baud rates set
identically. Using in-line amplifiers, up to 100 addressable masters can be
placed on one RS-422 network up to 4,000 feet (1219 meters) in length.
Figure 9.10 illustrates how to connect addressable masters.
Figure 9.10
Connecting Addressable DL20 Masters
RS-422 OUT -
RS-422 OUT +
GND
DL20
4
RS-422 IN -
5
RS-422 IN +
4,000 Feet (1,219 Meters) Maximum
DL20
RS-422 IN -
4
RS-422 IN +
5