Rockwell Automation 1794-L34 FlexLogix Controller System User Manual - Manual (Page 39)

Publication 1794-UM001G-EN-P - January 2007
Communicate over Networks 39
DH-485 For DH-485 communication, use the serial port of the controller.
However, when using a FlexLogix controller, it is recommended that
you use NetLinx networks (EtherNet/IP, ControlNet, or DeviceNet)
because excessive traffic on a DH-485 network may make it
impractical to connect to a controller with RSLogix 5000 programming
software.
The DH-485 protocol uses RS-485 half-duplex as its physical interface.
(RS-485 is a definition of electrical characteristics; it is not a protocol.)
You can configure the RS-232 port of the FlexLogix controller to act as
a DH-485 interface. By using a 1761-NET-AIC and the appropriate
RS-232 cable (1756-CP3 or 1747-CP3), a FlexLogix controller can send
and receive data on a DH-485 network.
If your application uses: Select:
• connections to existing DH-485 networks built-in serial port
connection from FlexLogix
controller to port 1 or port 2
FlexLogix controller
SLC 5/03 controller
1761-NET-AIC+
1747-AIC DH-485 network
1747-CP3
or
1761-CBL-AP00
or
1747-CP3
or