MVI56-DH485R
♦
ControlLogix Platform
Reference
DH485 Interface Module for Remote Chassis
User Manual
Page 80 of 97
ProSoft Technology, Inc.
August 27, 2009
The following illustration shows an example DH-485 network.
1
2
3
4
5
6
Chassis Gnd
Shield
Common
B
A
Termination
AIC+
1
2
3
4
5
6
AIC+
1
2
3
4
5
6
1747
-
AIC
To SLC 5/03
Channel 1
Port 2
Port 1
To
MicroLogix
1000
To
ProSoft DH485
RS-232
Workstation
To
ProSoft DH485
RS-232
DH485
Port RS-485
DB-9 Male
1747-PIC
This network displays the two different methods to configure the module for a
DH-485 network. Please note there is no place on the module’s RS-485 to land
the shield, and when used in the configuration shown, it must be wired externally.
Verify that the RS interface jumper on the module is set to the correct position:
RS-232 or RS-485.
Note:
Terminating resistors are generally not required on the RS-485 network, unless you are
experiencing communication problems that can be attributed to signal echoes or reflections. In this
case, install a 120 ohm terminating resistor on the RS-485 line.
5.3.3 DB9 to RJ45 Adaptor (Cable 14)