GE Industrial Solutions POWER LEADER ModBus Monitor - Manual (Page 18)

POWER LEADER Modbus Monitor
Chapter 2 – Installation
12
RS-485 Grounding Considerations
Figure 12 illustrates correct wiring for communications
and shield grounding. By following this example, a
secure grounding point will be provided for each device
on the network. Any surge will dissipate locally without
being carried up or down the network to other devices,
thus minimizing the chance for damage to devices due to
surge or EMI.
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Figure 12. RS-485 network wiring.
The RS-485 shield is attached to ground at the host. The
shield is not connected to the RS-485 IN port of the next
device, but is connected to the RS-485 OUT port and to
a grounding screw if the shield terminal of the RS-485
port is not directly grounded. This procedure provides an
isolated ground for each device.
IMPORTANT: The Modbus Monitor’s shield terminal is
not directly grounded. If you wish to connect the RS-485
shield to ground at the Monitor, you must also make a
connection from the shield terminal to the grounding
screw on the Monitor’s case. Use AWG #12-14 wire for
this connection.
Software Installation
Modbus Monitor Configuration Tool
Configuration of the Monitor requires a Windows-based
software program, the Modbus Monitor Configuration
Tool. This program is included with the Modbus
Monitor, on several 3.5” high density floppy disks. This
section describes installation of this software onto a PC.
A laptop PC’s portability lends itself well to this use if
configurations are to be downloaded to Monitors already
installed in the likely facility-floor setting. However, it is
acceptable to create configuration files on a desktop PC
and then copy the files to a laptop for transportation to
the Monitor’s location.
The Configuration Tool requires a 486 or better PC
running Windows 3.1x, at least 8 megabytes of RAM,
and a floppy drive for installing the Configuration Tool
from the floppy disk. A minimum of 15 megabytes of
hard disk space is required to install the Configuration
Tool. A mouse is recommended for ease of use, but not
required.
To install the Monitor Configuration Tool on the
selected PC:
1. Power up the PC and launch Windows. Start the
Windows Program Manager.
2. Insert the Monitor Configuration Tool disk
labeled “DISK 1”.
3. Select Run from the Program Manager’s File
Menu.
4. Enter A:\setup.exe and press return.