This list shows Modbus register numbers mapped to BACnet objects to be used when this gateway is functioning as a Modbus RTU slave or Modbus TCP server (slave). The external Modbus master should read/write the register numbers shown on this page to interact with the respective BACnet objects.

TO ADD REGISTERS start by clicking on any register number in the first column. This will take you to the register details page where you may add more registers to the list.

Click Update to retain changes. Click "Prev" or "Next" to scroll through the list of registers. You may also enter a number in the "Showing" box to jump directly to a given register when Update is clicked.

Click on the register number link in the Local Register column to configure that register or just view its details.

The Modbus register numbers displayed on this page may be read or written as holding registers or coils, and read as input registers or discrete inputs. Register number 1 as a holding register would be documented as 40001 using Modicon notation. Register number 1 would correspond to raw address zero as transmitted on the wire.