49
equivalent of an active-low alarm.
If the alarm input generates an active-low signal,
switching to Reversed operation means the
BVM 48 will declare an alarm in the absence of the active-low signal, creating the practical
equivalent of an active-high alarm.
If the alarm input is normally open,
switching to Reversed operation converts it to a normally
closed alarm point.
If the alarm input is normally closed,
switching to Reversed operation converts it to a normally
open alarm point.
Q. I'm unsure if the voltage of my power supply is within the specified range. How to I test the
voltage?
A.
Connect the black common lead of a voltmeter to the ground terminal of the battery. Connect the
red lead of the voltmeter to the batter's VCD terminal. The voltmeter should read b12
and +30VDC.
SNMP FAQs
15.2
Q. Which version of SNMP is supported by the SNMP agent on the BVM?
A.
SNMP v1 and v2c.
Q. How do I configure the BVM 48 to send traps to an SNMP manager? Is there a separate MIB
for the BVM 48? How many SNMP managers can the agent send traps to? And how do I set
the IP address of the SNMP manager and the community string to be used when sending
traps?
A.
The BVM 48 begins sending traps as soon as the SNMP managers are defined. The BVM 48 MIB is
included on the BVM 48 Resource CD. The MIB should be compiled on your SNMP manager. (
Note:
MIB versions may change in the future.) The unit supports 2 SNMP managers, which are
configured by entering its IP address in the Trap Address field of Ethernet Port Setup. To configure
the community strings, choose SNMP from the Edit menu, and enter appropriate values in the Get,
Set, and Trap fields.
Q. Does the BVM 48 support MIB-2 and/or any other standard MIBs?
A.
The BVM 48 supports the bulk of MIB-2.
Q. Does the BVM 48 SNMP agent support both BVM 48 and T/MonXM variables?
A.
The BVM 48 SNMP agent manages an embedded MIB that supports only the BVM 48's RTU
variables. The T/MonXM variables are included in the distributed MIB only to provide SNMP
managers with a single MIB for all DPS Telecom products.
Q. How many traps are triggered when a single point is set or cleared? The MIB defines traps
like "major alarm set/cleared," "RTU point set," and a lot of granular traps, which could
imply that more than one trap is sent when a change of state occurs on one point.
A.
Generally, a single change of state generates a single trap.
Q. What does "point map" mean?
A.
A point map is a single MIB leaf that presents the current status of a 64-alarm-point display in an
ASCII-readable form, where a "." represents a clear and an "x" represents an alarm.
Q. The BVM 48 manual talks about control relay outputs. How do I control these from my SNMP
manager?
A.
The control relays are operated by issuing the appropriate set commands, which are contained in
the DPS Telecom MIB.
