You can do this via a REST call. In 4.3SP2, we now have the api interface where you can see REST calls at work. It can be accessed via the same URL as the PAM GUI but instead of itpam, use api. So if you go to http://servername:8080/itpam to get to PAM, try http://servername:8080/api. (again, this API interface is only available in 4.3SP2 and above).
Here is the doc on this:
CA Process Automation Open REST APIs - CA Process Automation - 04.3.02 - CA Technologies Documentation
I used the GET runtimeinfo call and gave it the id for my orchestrator (which can be obtained from the NodeConfiguration.properties file located in the PAM install folder under server\c2o\.config). This returned the following XML:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Response> <Code>200</Code>
<Details xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="allRuntimeInfoBean">
<Completed>0</Completed>
<Failed>0</Failed>
<Aborted>0</Aborted>
<Queued>0</Queued>
<Running>0</Running>
<Suspended>0</Suspended>
<Waiting>0</Waiting>
<Blocked>0</Blocked>
<Total>0</Total>
</Details>
<Message>Success</Message>
</Response>