Zhejiang NVR300 Series, Быстрое руководство

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21
Connecting to a Third-Party Device
The device supports two types of RS485 interface: RJ45 and Phoenix
connector for connection with third-party devices.
RS485 Serial Cables
Twisted pair is recommended. 22-28AWG insulating core wire,
preferably 24AWG or 26AWG can be used.
Refer to the table below for the maximum length of RS485 serial
cables with different baud rates.
Table 4-1 Maximum length of RS485 serial cables at different baud
rates
Baud rate (bps) Maximum length (m)
1200,2400,4800,9600,19200 900
38400 850
57600 550
115200 250
Connecting to a third-party device via RS485 interface
Use an RS485
（
422 compatible
）
connector under the RJ45 category
to connect to a third-party device.
A third-party device control cable must be an RS485 cable that meets
the following requirements:

The RJ45 connector's T+ and R+ terminals are shorted and then
connected to the third-party device's RS485+ connector; the RJ45
connector's T- and R- terminals are shorted and then connected to
the RS485 connector of the third-party device, as shown in the
following figure.