EM is a application that is deployed over the admin server.
Like in case of a normal applications deployed on wls server , you can start and stop the EM application from the weblogic console--> deployments--> EM
To start and stop applications using wlst scripts, please find the commands.
Start an application: progress=startApplication('BigApp', stageMode='NOSTAGE', testMode='false')
Status of an application: progress.getState()
Stop an application: progress=stopApplication('BigApp')
BigApp is a sample application, I have mentioned above. You can use any application which you want to start and stop.
mark if this helps.
Do you mean EM agents ? or just an EM application deployed on the admin server ?
To start and stop em agents
<oem agent>/bin/emctl stop agent
<oem agent>/bin/emctl start agent
To start and stop EM application
you can use either WLST or weblogic.Deployer
java weblogic.Deployer -examples will provide you the syntax which you can use to stop and start application