# BASEstartm Open DAS
for Allen-Bradley Data Highwaytm
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 Allen-Bradley PLCs, and how to access these functions.

# 3.1 Accessing Allen-Bradley Functions

DAS for Allen-Bradley Data Highway 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 BASEstar Open Callable Services, refer to the BASEstar Open for OpenVMS Application Programming Interface.

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 Allen-Bradley Data Highway. 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 Allen-Bradley Data Highway supports the following client functions for all supported devices:

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

The DAS for Allen-Bradley Data Highway supports the following server functions (indications) for all supported devices:

- Write indication
- Abort

Note Information Report is still supported for backward compatability but support will be dropped in a future release of the DAS. Support for SLC controllers does not include information report as an option. Configurations should be modified to use write indication support as soon as possible.

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