Echelon OpenLDV User Manual download pdf (Page 83)

OpenLDV Programmer’s Guide 75

Message Type Message Codes (Hex)

Foreign responder offline 4F

Network diagnostic message 50 .. 5F

Network management message 60 .. 73

Router configuration message

(not used by the network interface)

74 .. 7C

Network management escape code 7D

Router far side escape code

(not used by the network interface)

Service pin message 7F

Sending Messages to the Network Interface

Some messages can be sent to the network interface itself. For example, the

NM_update_domain (0x63) message can be sent to the network interface using

the niNETMGMT network interface command. This message sets the network

address (domain ID, subnet ID and node ID) used by the network interface.

Some network interfaces require authentication for local network management

commands. Thus, you should always set the auth bit of the ExpMsgHdr to 1 for

local network management commands. See ExpMsgHdr on page 63 for

information about the message header.

Receiving Messages from the Network Interface

Incoming application, foreign frame, and network variable messages are passed

unchanged to the OpenLDV application. Most network management messages

received are handled by the network interface itself. However, the network

management messages listed in Table 32 can be passed to the OpenLDV

application, which must respond appropriately. See the ISO/IEC 14908-1

protocol specification for information about these network management and

diagnostics messages.

The OpenLDV Developer Example contains an example framework for

recognizing and processing these messages.

Table 32. Network Management Messages Passed to the OpenLDV Application

Message Code Comments

Query NV Config 0x68 OpenLDV application should respond with data from the

network variable configuration table or alias table.

Update NV Config 0x6B OpenLDV application should write its own network variable

configuration or alias table, respectively.

1 2 ... 78 79 80 81 82 83 84 85 86 87 88 ... 193 194

No comments

Echelon OpenLDV User Manual Page 83