Allen-Bradley ControlLogix 1756-DH485, User Manual, Page: 25 / 110

Publication 1756-UM532A-EN-P - May 2006
Overview of the DH-485 Network 2-7
Node Address Identification
Misconception about the
1761-NET-AIC Converter
The function of the 1761-NET-AIC converter is to accomplish two tasks. The
first is to convert RS232 electrical signals to RS485 electrical signals and RS485
electrical signals to RS232 electrical signals.
The second function is to provide electrical isolation between all three
communication ports. This protects against ground loops and voltage
differences between devices connected to the 1761-NET-AIC converter.
A common misconception is that the 1761-NET-AIC device converts
protocol,
this is not true , it passes the protocol but converts the electrical
signals. An example device that would convert protocol and electrical signal is
the 1747-KE module.
Refer to the Isolation Interface Converter (AIC+) User Manual, publication
1761-UM004 for complete information.
1747-UIC USB to DH-485
Interface Converter
The 1747-UIC lets you connect DH-485 devices directly to a computer’s USB
port. It features an RS-232 port for connection to SLC 5/03 and higher
controllers, MicroLogix, PanelView 300 and higher terminals,
1761-NET-AIC+, and Logix controllers, as well as an RS-485 port for
connection to SLC 5/03 and lower controllers, PanelView 300 and higher
terminals, and 1747-AIC. The converter can communicate with devices on the
DH-485 network at 19.2K baud.
Use this write-on area
to mark the node address
of each connection.
Port 2 Node Address
(The node address is
configured in the device
connected to Port 2.)
Port 1 Node Address
(The node address
is configured in the
device connected to
Port 1.)
There is no node
address associated
with the network port
(Port 3).