... camera testingu Transmission channel testing of video u Control PTZ protocol cctv tester Features:u 2.8" TFT-LCD screen, English menu, display signal systemu ... :Support RS323, RS422, RS485 at the same timeCommunication protocol:Compatible with various protocols: Pelco_D, Pelco_P, Samsung, Panasonic, Minking, Vido, Yaan etc ... % ~ 90%Size:170mm(L) X 99mm(w) X 48mm(H) 2.8" cctv tester