User Manual for Commercial Series Net DVR

3 How to make a RS-232 connect cable

Material and tool

One twisted cable (8 pins), one standard RJ45 head, one or more DB25 or DB9 plug-ins, a tool for RJ45, one electric iron, and some soldering tin.

Pin definition

Make the RJ45 according to the following pin definition; I means DVR input, O means DVR output.

Pin index

Name

I/O

Description

1

DCD

I

Carrier Detect

2

RxD

I

Receive Data

3

TxD

O

Transfer Data

4

CTS

I

Clear Data

5

RTS

O

Request to Send

6

DTR

O

Terminal Device Ready

7

GND

 

Ground

8

Null

 

 

 

 

 

 

According to demand, the following three situations are considered to make the serial port plug-in according to the corresponding relationship of the pin definition.

(1)When the serial port of the DVR is connected with the DTE device with DB25 plug-in (terminal like computer, annunciator, door access etc), the corrresponding relationship is as follows:

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