I have an APC 
(http://www.apc.com/products/resource/include/techspec_index.cfm?base_sku=AP7723&tab=models]AP7723
Transfer Switch). It is a great piece of hardware, which supports
monitoring over SNMP as well. However, I'm not able find correct OID's
to ask.

I know, that it's possible to poll for example selected power source,
redundancy state, output voltages, output current etc. However, I did
a fallowing test:


#ATS load is 0.8A
mar...@home:~> snmpwalk -c public -v 2c 192.168.1.101 > /tmp/apc1
#I increased ATS load to 2.2A
mar...@home:~> snmpwalk -c public -v 2c 192.168.1.101 > /tmp/apc2
#diff between /tmp/apc1 and /tmp/apc2 should show this increase from
0.8A to 2.2A
mar...@home:~> diff -u /tmp/apc1 /tmp/apc2 | grep -E '^\-|^\+'
--- /tmp/apc1   2010-04-07 10:39:49.000000000 +0300
+++ /tmp/apc2   2010-04-07 10:41:59.000000000 +0300
-DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (5331955) 14:48:39.55
+DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (5344955) 14:50:49.55
-IF-MIB::ifInOctets.2 = Counter32: 1864540
+IF-MIB::ifInOctets.2 = Counter32: 1888174
-IF-MIB::ifInUcastPkts.2 = Counter32: 4925
+IF-MIB::ifInUcastPkts.2 = Counter32: 5176
-IF-MIB::ifInNUcastPkts.2 = Counter32: 11308
+IF-MIB::ifInNUcastPkts.2 = Counter32: 11314
-IF-MIB::ifOutOctets.2 = Counter32: 625738
+IF-MIB::ifOutOctets.2 = Counter32: 650566
-IF-MIB::ifOutUcastPkts.2 = Counter32: 4816
+IF-MIB::ifOutUcastPkts.2 = Counter32: 5067
-IP-MIB::ipInReceives.0 = Counter32: 16162
+IP-MIB::ipInReceives.0 = Counter32: 16419
-IP-MIB::ipInDelivers.0 = Counter32: 15511
-IP-MIB::ipOutRequests.0 = Counter32: 4943
+IP-MIB::ipInDelivers.0 = Counter32: 15768
+IP-MIB::ipOutRequests.0 = Counter32: 5194
-IP-MIB::icmpInMsgs.0 = Counter32: 207
+IP-MIB::icmpInMsgs.0 = Counter32: 210
-IP-MIB::icmpInEchos.0 = Counter32: 9
-IP-MIB::icmpInEchoReps.0 = Counter32: 197
+IP-MIB::icmpInEchos.0 = Counter32: 11
+IP-MIB::icmpInEchoReps.0 = Counter32: 198
-IP-MIB::icmpOutMsgs.0 = Counter32: 206
+IP-MIB::icmpOutMsgs.0 = Counter32: 209
-IP-MIB::icmpOutEchos.0 = Counter32: 197
-IP-MIB::icmpOutEchoReps.0 = Counter32: 9
+IP-MIB::icmpOutEchos.0 = Counter32: 198
+IP-MIB::icmpOutEchoReps.0 = Counter32: 11
-UDP-MIB::udpInDatagrams.0 = Counter32: 4547
-UDP-MIB::udpNoPorts.0 = Counter32: 10643
+UDP-MIB::udpInDatagrams.0 = Counter32: 4795
+UDP-MIB::udpNoPorts.0 = Counter32: 10649
-UDP-MIB::udpOutDatagrams.0 = Counter32: 4652
+UDP-MIB::udpOutDatagrams.0 = Counter32: 4900
-SNMPv2-MIB::snmpInPkts.0 = Counter32: 4562
-SNMPv2-MIB::snmpOutPkts.0 = Counter32: 4562
+SNMPv2-MIB::snmpInPkts.0 = Counter32: 4810
+SNMPv2-MIB::snmpOutPkts.0 = Counter32: 4810
-SNMPv2-MIB::snmpInTotalReqVars.0 = Counter32: 4572
+SNMPv2-MIB::snmpInTotalReqVars.0 = Counter32: 4820
-SNMPv2-MIB::snmpInGetNexts.0 = Counter32: 4576
+SNMPv2-MIB::snmpInGetNexts.0 = Counter32: 4824
-SNMPv2-MIB::snmpOutGetResponses.0 = Counter32: 4586
-SNMPv2-MIB::snmpOutTraps.0 = Counter32: 2682
+SNMPv2-MIB::snmpOutGetResponses.0 = Counter32: 4834
+SNMPv2-MIB::snmpOutTraps.0 = Counter32: 2688
mar...@home:~>

As I understand, there are only network related differences present
like counted packages of different protocols(ICMP, SNMP, etc). Any
ideas how to poll more data(like output voltages and output current)
from this APC Transfer Switch over SNMP using snmpwalk?

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