Echelon OpenLDV User Manual Page 20
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12 Using the OpenLDV API
Application Layer
OpenLDV API
Presentation Layer
OpenLDV Application
OpenLDV Driver (Ldv32.dll)
SLTA
Link Layer
PCLTA
Link Layer
PCC
Link Layer
USB
Link Layer
SLTA-10
PCLTA-10
PCLTA-20
PCC-10
U10
U20
L
ON
W
ORKS
Network
xDriver
Link Layer
SmartServer
i.LON
Interfaces
Compatible
with
OpenLDV
API
OpenLDV
Interface
and Driver
Software
OpenLDV
Application
Figure 4. OpenLDV Application Architecture
An OpenLDV application implements the application and presentation layers,
and uses the OpenLDV API (with the OpenLDV driver, Ldv32.dll) as an
interface layer to communicate with a network interface. The network interfaces
communicate with the L
ONWORKS network. Although the figure shows Echelon
network interfaces, most third-party network interfaces can also use the
OpenLDV driver.
An OpenLDV application that uses the OpenLDV API can establish downlink
connections (session initiation from the application to the local or remote network
interface), and it can accept uplink session requests (session initiation from the
remote network interface, using the xDriver Broker service, to the application).
Application Layer
The application layer is responsible for sending data to the LONWORKS network
through output network variables and outgoing application messages, and
receiving L
ONWORKS network data through input network variables and
incoming application messages. Typically, the bulk of an OpenLDV application’s
code is at the application layer.
- OpenLDV 1
- Programmer’s Guide 1
- Welcome 3
- Audience 3
- Examples 4
- Related Documentation 4
- Table of Contents 5
- Introduction 9
- ONWORKS network: 10
- OpenLDV Driver 11
- Client Applications 11
- Network Interfaces 12
- Installing the OpenLDV SDK 14
- Using the OpenLDV API 17
- ONWORKS network 18
- Application Layer 20
- Presentation Layer 21
- Overview of the OpenLDV API 21
- The OpenLDV API 23
- ONWORKS interface device 24
- ONWORKS name (such as 24
- LDVDevices Structure 46
- LdvCombineFlags Enumeration 47
- LdvDeviceCaps Enumeration 48
- LDVDriverInfo Structure 50
- LdvDriverID Enumeration 51
- LdvDriverType Enumeration 52
- OpenLDV API Return Codes 53
- ONWORKS Interfaces 57
- msgSize); 62
- Constructing Messages 66
- Application Buffer Structure 66
- Layer 2 Buffer Structure 69
- Application Layer Header 69
- Layer 2 Header 69
- Layer 5 Buffer Structure 70
- Message Header 70
- ExpMsgHdr 71
- NetVarHdr 73
- ONWORKS transceivers 74
- Network Address 75
- RcvAddrDtl 78
- RespAddrDtl 80
- Message Data 81
- UnprocessedNV 82
- ExplicitMsg 82
- Downlink Commands 84
- Uplink Commands 85
- Immediate Commands 85
- Network Interface Commands 85
- Common Definitions 98
- Dispatchers 98
- Toolkits and User Interface 99
- Developer Example Diagram 100
- ONWORKS 101
- LNS Applications for xDriver 106
- Extending xDriver 107
- Downlink Sessions 108
- 102 Extending xDriver 110
- Typical Downlink Scenario 111
- Uplink Sessions 112
- ONWORKS network, in a 114
- Typical Uplink Scenario 115
- Session Control Object 116
- Authentication Key Handling 119
- ONWORKS \xDriver\Components 123
- Add a COM Object 124
- Test the Lookup Extension 132
- Optional Steps 132
- Add a COM Class 135
- LNS Programming with xDriver 145
- ONWORKS networks 147
- ONWORKS networks by 148
- Uplink Sample Application 150
- Custom Network Interfaces 155
- Overview 156
- Windows Registry Entries 158
- LNS Methods and Events for 161
- AcceptIncomingSession 162
- Remarks 162
- BeginIncomingSessionEvents 163
- EndIncomingSessionEvents 163
- NetworkInterfaces.Item( ) 164
- Syntax 164
- OnIncomingSessionEvent 165
- ReleasePendingUpdates 166
- Custom Lookup Extension 169
- Component Programming 169
- ILdvxConfigure Interface 170
- SetInstance Method 170
- Returns 171
- SetOptions Method 171
- ILdvxLookup Interface 172
- DownlinkLookup Method 172
- UpdateLookup Method 173
- UplinkLookup Method 173
- ILdvxSCO Interface 174
- GetDownlinkKey Method 177
- GetUplinkKey Method 180
- SetAuthenticationFlag Method 181
- SetDownlinkKey Method 183
- SetEncryptionType Method 183
- SetLNSNetworkName Method 184
- SetUplinkKey Method 186
- ILdvxSCO_TCP Interface 186
- GetRemoteTCPAddress Method 187
- GetRemoteTCPPort Method 187
- SetRemoteTCPAddress Method 188
- SetRemoteTCPPort Method 188
- ILdvxSCO2 Interface 189
- GetNeuronID Method 189
- 184 Index 192
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