Modbus RTU Server Remap Table Edit

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The edit page for server address map is very simple.

Modbus RTU master remap edit.jpg

Map local will indicate "number", "address", or "Modicon register", depending on your preference which you set under User Settings.

Register Number or Address – Enter the number (starting at 1) or raw address (starting at 0) as applicable. Do NOT enter 40001 for holding register 1 if you have not selected Modicon as the display format in your User Settings.

Modicon Register – Enter numbers like 40001 for the first holding register if you have selected Modicon representation in your User Settings.

As remote – The remote Modbus register address or number that this local address should be viewed as by remote clients or masters. Follow the same rules for number, address, or Modicon register as for the local value.


The Add Maps version of the remap edit page works as follows. Let's assume you start with the empty table illustrated below. You click the Add Maps button. Modbus server remap table empty.jpg


The add/edit page is very simple. Follow the same guidelines for local register numbers as noted above for editing. On this version of the edit, you provide an offset instead of specific register number. Each remapped number will be the local number plus offset. The other difference on the Add page is that you also have an ending local number. Click Add to add new entries for the entire range of addresses.

Modbus RTU master remap add header.jpg Modbus server remap add.jpg


The result in our example is: Modbus server remap table populated.jpg