Echelon OpenLDV User Manual download pdf (Page 156)

148 Custom Network Interface

Overview

Echelon and other manufacturers provide a wide selection of network interfaces

for different L

ONWORKS channel types and for various computer requirements.

You can also create a custom OpenLDV compatible network interface.

Figure 38 shows a simplified view of how a custom network interface

communicates with an application:

• When a user uses a custom network interface for the first time or installs

custom network interface software, Windows installs the device driver

for the network interface and updates the Windows registry. In

addition, a custom network interface might use additional software for

device configuration (for example, you can use the L

ONWORKS Interfaces

application in the Windows Control Panel to configure Echelon devices).

• The application uses the OpenLDV API to communicate with both the

network interface and the L

ONWORKS network. For example, the

application calls the ldv_open() function to open the custom network

interface for communications.

• The OpenLDV API uses the entries in the Windows registry to map the

custom network interface’s logical name (what is presented to the user or

the application) to the physical device name (what is presented to the

device driver). This mapping is done whenever the custom network

interface is opened for communications.

Device

Driver

OpenLDV API

Application

Windows

Registry

Windows Computer

Custom Network Interface

To L

ORKS

Network

Figure 38. A Custom Network Interface Communicates with an Application

This appendix describes how you can integrate a custom network interface driver

with the OpenLDV driver so that it is accessible from any OpenLDV application.

It does not describe how to develop the custom network interface hardware or

how to write the Windows device driver for the custom network interface.

Working with a Custom Network Interface

To make a custom Windows device driver accessible through the OpenLDV

interface, the driver must be a kernel-mode Windows Driver Foundation (or

Windows Driver Model) driver that provides standard create, read, write, and

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