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QSD42908 User’s Manual
93
Appendix C: DVR Connect Cable
Definition
1 How to Make a RS-485 Connect Cable
Material and tool
One twist cable (8 pins), one standard RJ45 connector and one tool special for RJ45.
RJ45 introduction
Pin definition
Make the connect cable according the following; to left point of RJ45 head, 1
st
and 2
nd
cables
are the anode and cathode line for sending, 3
rd
and 4
th
cables are the anode and cathode line for
receiving, 7 is the shared grounding line:
Pin definition for Standard RS-485 serial port RJ45 plug-in