FYI. The MIBs for the PTP600 are different than the PTP500 slightly. .1.3.6.1.4.1.17713.5.20.2.0 = PTP500 .1.3.6.1.4.1.17713.6.20.2.0 = PTP600
Notice the color coding in the text above. The octet is off by one. Replace the 5 with a 6 and your good.
FYI. The MIBs for the PTP600 are different than the PTP500 slightly. .1.3.6.1.4.1.17713.5.20.2.0 = PTP500 .1.3.6.1.4.1.17713.6.20.2.0 = PTP600
Notice the color coding in the text above. The octet is off by one. Replace the 5 with a 6 and your good.