... ports, 4. 4 groups control code. System Summarize:LH60-30 matrix switch /control system have powerful functions, which could meet ... system control solution by making use of exist network directlyLH60-30 Matrix switched /control system have 2 RS-485 ports, ... input, 1 channel alarm output, camera linkage switch, transfer preset point and assistant switchTechnical Index: Communication methodRS-485,RS-422 ...