Pepper-computer Modular Computers RS485 Uživatelský manuál stáhnout pdf (Strana 311)

SMART I/O User’s Manual

Chapter 6 Communications Modules

6.2.12 ‘C’ Programming

6.2.12.1 SM-SSI Library

The SM-SSI library of functions smartio.l provide a convenient way of

accessing the SM-SSI module.

• All functions are written in ANSI C;

• Prototypes are to be found in the file ssilib.h.

Hardware Requirements

• SMART I/O Base Module or Base Module and Extension unit;

• SM-SSI1 Module.

Software Requirements

The compiler from one of the following:

• Ultra C Version 1.1.2 or higher;

• FasTrak 2.02 or higher.

The leftmost SM-Module has number 0 assigned to it a far as programming

is concerned although physically this is slot 1!

Before a library function can be used, the function SMSSIInit must first be

called. This allocates the requested resources. Furthermore, this function

needs to be called for each SM-SSI Module called within the task. Upon

completion of the application, the function SMSSIDeInit needs to be called

for each SM-SSI Module that has been initialized.

In order to illustrate the use of the SM-SSI library, an application example

called demssi.c can be found in the SMART I/O application directory (nor-

mally found in /<device>/APPLIC/SMART/CMDS).

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Pepper-computer Modular Computers RS485 Uživatelský manuál Strana 311