This page only applies if the local device is configured as a Master.

Map number simply tells you where you're at on the list of register maps. Click "next" and "prev" to scroll through the list. To advance directly to a specific map, enter the desired number in the "Showing" box, then click Update.

Maps entered on this page only read data from remote devices. Go to the RTU Write Map to write data to those devices. The full parameter set is different for read versus write.

An abbreviated version of a list of maps is shown on this page. Any of the parameters shown may be changed here and registered by clicking the Update button. To view and/or modify the complete set of parameters, click on the map number in the left most column.

For each remote register to be read, enter the register type, format, number, and provide the RTU slave address, also referred to as Remote Unit #. If register format is CHAR, you need to click on the map number and set the string size on the expanded view of the map. For coils or discrete inputs, use INT-16 or UINT-16 for register format - in this case, format only affects formatting of local register data. Modbus data will be placed in the local object designated.

Local Object # is a label such as "AI 2" following the format "XX N" where XX is a 2-character object type abbreviation, and N is the instance number. The following abbreviations are recognized:

Selecting "none" for remote type effectively deletes the map even though it will still appear in the list until deleted. Unused maps at the end of the list will always show none as the type.