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More than 256 doors in a Modbus Slave configuration

More than 256 doors in a Modbus Slave configuration

Issue

The SP-C's Modbus service supports up to a maximum of 256 doors. How can the system support more than 256 doors in a single system setup?

Product Line

Security Expert

Environment

  • Security Expert Controller (SP-C)
  • Modbus

Cause

The Modbus services 256 door limit is per SP-C. There are more than 256 Doors in the Security Expert system that need to be shared through a Modbus integration.

Resolution

For additional doors to be supported through Modbus, additional controllers will need to be configured with the Modbus service.

It should be noted that if any Doors share hardware (inputs, outputs, etc...) with other controllers then this Door is also downloaded to the controller with that hardware. This should be kept in mind when determining how many Modbus services will need to be configured and on what controllers.

For further details on how to configure the Modbus service consult the attached application note AN_023_Protege_Controller_ModBUS_Slave.

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