1，2，3，4，5，6，7，8，9，10，11，12，13，14，15，16ALARM 1 to ALARM 16. The alarm becomes active in low voltage.1-ON C，2-ON C，3-ON C，4-ON C，5-ON C，6-ON C，7-ON C，8-ON CEight groups of normal open activation output (on/off button)G GND cable.A/B The A/B cable to control the RS485 devices. It is to connect tocontrol devices such as PTZ dome camera. 120Ω should be parallelconnected between A, B lines on the far end to reduce reflection andguarantee the signal quality.Tx and Rx RS232 port. Tx is the data output cable and the Rx is the data inputcable.2.3.1.2 NVR608--4K SeriesYou can refer to the following sheet for alarm input and output information. See Figure 2-18.Figure 2-18Icon Note1，2，3，4，5，6，7，8，9，10，11，12，13，14，15，16ALARM 1 to ALARM 16. The alarm becomes active in low voltage.1-ON C，2-ON C，3-ON C，4-ON C，5-ON C，6-ON C，7-ON C，8-ON CEight groups of normal open activation output (on/off button)GND cable.A/B The A/B cable to control the RS485 devices. It is to connect tocontrol devices such as PTZ dome camera. 120Ω should be parallelconnected between A, B lines on the far end to reduce reflection andguarantee the signal quality.24
