Echelon OpenLDV User Manual download pdf (Page 48)

40 Using the OpenLDV API

1. Set the nCaps to LDV_DEVCAP_PA to specify protocol analyzer

capability.

2. Set nCombine to LDV_COMBINE_DEFINITELY_ALL (or

LDV_COMBINE_DEFINITELY_ANY) to specify that the function

should return all devices that definitely are defined as protocol analyzers.

If you want the function to return all devices that are definitely protocol

analyzers along with devices that might be protocol analyzers (devices

with multiple capabilities), specify LDV_COMBINE_POSSIBLY_ALL

(or LDV_COMBINE_POSSIBLY_ANY).

3. Prepare the pDevices output buffer for the returned results.

LDVCode rc = ldv_get_matching_devices(

LDV_DEVCAP_PA,

LDV_COMBINE_DEFINITELY_ALL,

*myPA_List);

LdvDeviceCaps Enumeration

Table 25 describes the enumerated values for the LdvDeviceCaps device

capabilities, which describes the capabilities of a L

ONWORKS interface device.

These constants can be OR’ed together for L

ONWORKS interface devices that

support multiple capabilities.

See ldv_open_cap() on page 25 for information about how to specify device

capabilities.

Table 25. OpenLDV Device Capabilities (LdvDeviceCaps)

Device Capability

Numeric

Value Description

LDV_DEVCAP_UNKNOWN 0x00000000 An unknown device, or a

device whose capabilities

cannot be determined

LDV_DEVCAP_L5 0x00000001 The device can operate as a

Layer 5 network interface.

LDV_DEVCAP_L2 0x00000002 The device can operate as a

Layer 2 network interface.

LDV_DEVCAP_LWIP 0x00000010 The device can operate as an

IP-852 device or channel.

These types of devices are

implemented within the LNS

Server and cannot be opened

using the OpenLDV API.

LDV_DEVCAP_PA 0x00000020 The device can operate as a

protocol analyzer interface.

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