Echelon DM-21 Device Manager - Manual (Page 89)

Device Manager User’s Guide 7-3
Figure 7.1 – Select Database Name
Before clicking Next and compressing the database set the database version by
clicking the Options button to open the dialog shown in figure 7.2.
Figure 7.2 – Database Version Number
Select a database version that makes sense for your application. Each version
can be numbered from 0 to 65535. Once a database is assigned and all Device
Managers are loaded with the same database it is a simple matter for a device in
the system to monitor and compare the database versions of all the Device
Managers in the system. If a discrepancy in the database version is detected
among the Device Managers, the device can flag an operator to indicate the
potential error condition.
The simplest means for a device to monitor Device Manager databases is for the
device to periodically issue a DMCMD_QUERY_DM_PROPS command, which
will cause the Device Managers to respond with DMREP_DM_PROPS reports.