Alpha Technologies Cordex Controller Ver.3.1x - Manual (Page 117)

115 0700015-J0 Rev B
10.1.4 Variable Binding (VarBind)
A VarBind is a sequence of two specific fields, an Object Identifier (ID) and the value for/from that Object
ID. A VarBindList is a simple list of these pairings.
The following screen capture shows the Event Properties employed.
10.2 Network Manager MIB Files
The SNMP network manager requires the following files: 1) Alpha_System_Controller.MIB, 2) MIB_ii.MIB,
3) SMI.MIB, and TSI_Module_MIB_for_CXC.MIB.
To obtain MIB files, logon to www.alpha.ca/downloads and select software (under Support on the home
page). The MIB variables (in the file Alpha.MIB) are as follows:
• System Variables (voltage, current, major and minor alarms)
• System Strings (site name, contact number, system type, serial number, software version , etc.)
• Traps (Alarm Active, Alarm cleared, Relay, COM OK, Startup, Shutdown, etc.)
• Output Table (Relays, Analog Outputs)
• Alarm Table (12 subcategories, including rectifier alarms, voltage alarms, battery alarms, etc.
• Inputs Table (7 subcategories, including digital inputs, controller inputs, custom inputs)
• External Controls – Resync Alarms
• Varbind Name Reference (Alarm Trigger Value, Timestamp)
The Alpha MIB file provides separate object identifier (OID) for active and cleared alarm traps.
Alarm status and signals are reconstructed into tables and sub tables to allow for future expansion while
remaining backward compatibility with already defined alarms and signals. See Section 10.3.
10.2.1 SNMP Set and Get Commands
All values from the MIB can be retrieved over SNMP using SNMP set commands. Most values are read-
only and cannot be set over SNMP. The exceptions to this are:
• Resync Alarms command, which can be set by sending an SNMP set command to the External
Controls “Resync Alarms” OID.
• Custom Input signals, which can be set by sending an SNMP set command to the Inputs Table Cus-
tom Input OID for the particular signal which should be set. For more information, see the Custom
Signals section Figure 62.
Figure 142 — VarBinds