Echelon DM-21 Device Manager - Manual (Page 77)

Device Manager User’s Guide 6-3
Node_SetTime 84
Event log timestamps are derived from this
reference. Set this network variable using an
external device (such as the LonPoint SCH-10
Scheduler Module) to provide a time reference.
This network variable should be updated from
the external source once every few minutes to
ensure synchronized timestamps between
devices in the network.
If this network variable is not initialized, the
Device Manager will use an internal software
clock to timestamp events. This internal clock
is not synchronized to local time, however it
provides the reader of the event log with a
general indication of how much time has
elapsed between events.
If the Device Manager is reset, the clock will
also be reset.
Node_Status 93 Standard L ON M ARK
Node_Status
network
variable used to manage objects (disable,
enable, etc). See the L
ON M ARK Application
Layer Interoperability Guidelines for complete
details.
FTP_FileStatus 74
FTP_FileStatus
, along with
FTP_FileRequest
and
FTP_FilePosition
is
used to implement interoperable file transfer.
Refer to the L
ON M ARK Interoperable File
Transfer Guidelines for details.
Node_Request 92 Standard L ON M ARK
Node_Request
network
variable used to manage objects (disable,
enable, etc). See the L
ON M ARK Application
Layer Interoperability Guidelines for complete
details.
Device Manager (LM Object Index 14)
DM_Command
DM_DBSelection
DM_VarLocId DM_Event
DM_Report
Device Manager
Figure 6.2 – Device Manager Functional Block
The core logic for managing the Device Manager network is implemented in the
Device Manager functional block (see figure 6.2). The network variables on this
functional block are described in table 6.2.