Maxtor 16Channel Stand Alone DVR Manual de usuario descargar pdf (Pagina 41)

c. For too long signal wires, 120Ω should be parallel connected between A, B lines on the far end

to reduce reflection and guarantee the signal quality.

d. “485 A, B” of DVR cannot parallel connect with “485 port” of other device.

e. The voltage between of A,B lines of the decoder should be less than 5v.

4. Please make sure the front-end device has soundly earthed.

Improper grounding may result in chip damage.

3.7.1 Alarm Input and Output Details

This series product has three types of alarm ports. Please refer to the following three figures for

detailed information. There are two alarm input types for you to select: normal open (NO) and

normal close (NC).

Important

Please refer to the specifications for the alarm input and output channel amount. Do not

merely count the alarm input and out channel amount according to the ports on the rear

panel.

One type of the alarm port is shown as in Figure 3-15.

Figure 3-15

You can refer to the following sheet for alarm input and output information.

Parameter

Grounding Alarm

Ground line

Alarm Input 1, 2, …, 8. It becomes valid in low voltage.

1-NO C，

2-NO C，

3-NO C

Three NO activation outputs.

485 A/B 485 communication port. They are used to control devices such as

PTZ. Please parallel connect 120Ω between A/B cables if there are

too many PTZ decoders.

One type of the alarm port is shown as in

Figure

3-16.

AB Connection

port

AB connection

port

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Maxtor 16Channel Stand Alone DVR Manual de usuario Pagina 41