# BASEstartm Open DAS
for Modicon®
on OpenVMStm
Installation and User's Guide

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# Chapter 3
Using the DAS

This chapter provides information about the supported functions for Modicon devices, and how to access these functions.

# 3.1 Accessing Modicon Functions

DAS for Modicon programmable controllers functions are accessed through the following interfaces:

- BASEstar Open Command Language Interface (CLI)
- BASEstar Open Application Programming Interface (API)
- OMNI Application Programming Interface (API)

Command Language Interface (CLI)

To access the BASEstar Open CLI, enter the following command at the DCL prompt ($):

    $ CLI_BSTR

For information about BASEstar Open commands, refer to the BASEstar Open for OpenVMS Command Language Interface.

Application Programming Interface (API)

For information on accessing OMNI Callable Services, refer to the Compaq OMNI for OpenVMS Application Programmer's Interface.

# 3.2 Supported Functions

A variety of functions are supported by the DAS for Modicon programmable controllers. These functions may be supported as either client or server or both. If a function is supported as a server, then the application will receive an indication when the VMD is requesting the service.

The DAS for Modicon programmable controllers supports the following client functions for all supported devices:

- Connect
- Read Variable
- Write Variable
- Abort
- Conclude

The DAS for Modicon programmable controllers supports the following server functions (indications) for all supported devices:

- Write indication
- Abort

## 3.2.1 Connect, Conclude and Abort Functions

Table 3-1 lists the connect, conclude and abort functions available through the OMNI (API) interface.

Table 3-1 Connect, Conclude and Abort Interface Access
Interface | Function Name
--- | ---
API | omni_connect
| omni_connect_a
| omni_conclude
| omni_conclude_a
| omni_abort
| omni_abort_a

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