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Chapter 4: System Design and Installation Pointe Controller User Guide
82
4.5.2 Modbus Address
The addressing that you, the system designer, must set is the address set via
rotary address switches in the Pointe Controller base unit. Each controller in your
system must have its own unique address. This address, a value between 00 and
97, is how the software in the master PC identifies each controller.
NOTE: Addresses 98 and 99 are reserved for performing hardware resets. For
more information, see page 230.
To get to the address switches, you must first remove the end cover from the base
unit. To do this, simply squeeze the latching tabs, shown in the figure below, and
lift the cover off.
Removing the end cover will expose the base motherboard. The address switches
will be found near the connector for slot 0.
To set the controller’s Modbus address, rotate the switches to the desired values.
The switch on the left is the “tens” digit. The switch on the right is the “ones”
digit. A small flat blade screwdriver is the only tool you need. The address shown
on the figure above is “25.”
Remember that each Pointe Controller unit on your network must have its own
unique Modbus address, which is set prior to applying power to the controller.
Duplicate addresses will cause system communications to fail.
For more information on configuring Modbus communications, see Chapter 8,
“Networked Operations,” starting on page 216.
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