HIKVISION DS7208HVI-ST/SE Ürün/Bakım Kılavuzu - Sayfa 12

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BD9329 （U2）

SATA

power

interface

5.6.

RS485

Module

RS485 main control chip: SP491EEN, PIN 9, 10 were TX +,TX-,the



difference voltage close to 5 V

TVS: B03NC (BA5/6/7/8), HK-4 (D2/3/4/5) protect the sending end (TX +,



TX-R +, R-)

Thermistors (JK250) : JK250 (RPT1/2/3/4) protect the sending end (TX +,



TX-R +, R-)

RS485 module part:



HK-4（D2/3/4/5）

SATA interface

B03NC （BA5/6/7/8）

JK250 （ RPT1/2/3/4）

SP491EEN