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MODBUS Communications Driver - Functions

Function Summary

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:

Address

Writable

Type

0xxxx

Yes

Internal Discretes (digital points) and

Discrete Outputs (Coils)

1xxxx

No

Discrete (digital) Inputs

3xxxx

No

Input Registers

4xxxx

Yes

Holding Registers

Revision 2.210

June 6, 1998

Page 11

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