Satel 3AS Radio

I have a doubt regarding SATEL 3AS Serial Radio. I have a radio which is connected to PLC and another radio with the SCADA. I need to know whether the radio is Live or not. Using Saterm software i could check the transmitting and receiving data before connecting with the PLC. Once i connected with the PLC and SCADA is there any procedure to check whether the radio is in Live???

Please help me with this!!!!

Thanks and Regards,
Vaitheeswaran Elango.