oqapsking,
You should also check the posts in the link Archie provided previously (start from the very first post which shows common Modbus addressing and also check the video link and any pictures posted).
If you do a bit more research on Modbus, you might see something like this:
Coil Outputs - address range 0xxxxx (Boolean values or bit registers) should have Read/Write access
Digital Inputs - address range 1xxxxx (Boolean values or bit registers) should have Read Only access
Analog Inputs - address range 3xxxxx (Word values or 16-bit registers) should have Read Only access
Holding Registers - address range 4xxxxx (Word values or 16-bit registers) should have Read/Write access
Archie used decimal values since that appears to be the address format that AHMI controls accept.
For conversion of hex values to decimal, you can use Windows built-in calculator set to Programmer Mode (see the attached picture) or one of the online converters such as this:
http://www.binaryhexconverter.com/hex-to-decimal-converter