Hongdian H3304 4CH Dual SD MDVR User Manual

Page 18

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I/O & RS485 & RS232 &5V/12V Interface

No.

Label

Instruction

1

IO_IN1

Collect electrical level, used for turn light, braking,
alarm.etc which involves electrical change.

High level 3V~24V

Low level 0V~2.5V

2

IO_IN2

3

IO_IN3

4

IO_IN4

5

IO_IN5

6

IO_IN6

7

IO_OUT1

Alarm output i n t o electrical level, could connect
external device.

8

IO_OUT2

High level 3.3V

Low level 0V

9

Speed_IN

Connect external speed censor, support sine wave or
square wave input

10

GND

Connect ground

11

PC_TX1

Received Data device receive data (RS232)

12

PC_RX1

Transmitted Data device send data (RS232)

13

GND

Ground

14

PC_TX2

Received Data receive data (RS232)

15

PC_RX2

Transmitted Data device send data (RS232)

16

GND

Ground

17

RS485_B-

485-signal (RS485)

18

RS485_A+

485+ signal (RS485)

19

GND

Ground

20

RS485_B1-

485- signal (RS485)

21

RS485_A1+

485+ signal (RS485)

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