... on the backpanelA: Power supply socket: connect with three core power supply wireB: Resistance gauge tube socket (5 PIN): Instruction for ... end of apparatus------------- the end of vacuum gauge tube (1, 2, 3, 4) correspond with (1, 2, 3, 4) Option for ... or bi-directional interface output can communicate with computer (one computer can connect with 99 vacuum gauge controllers in maximum).E: Two groups ...