MODBUS Communications Driver - Functions
This section contains a “synopsis” of each function supported by the MODBUS driver. The functions are listed in a “C-like” format showing the types of all variables. Note that this a hybrid of how the functions are declared and how they would be used in a real program; it is strictly for explaining the functions.
Note: Throughout this section of the manual, we will refer to “addresses”. These addresses are used as defined in the MODBUS Process Control protocol manual. That is, they are decimal numbers between 00000 and 49999. The corresponding addresses are:
Internal Discretes (digital points) and
Discrete Outputs (Coils)
Discrete (digital) Inputs
June 6, 1998