HIKVISION DS-6100HCI-ATA Series User Manual page 10

(2) 25-pin to 9-pin converter's internal connection is like this:
(3) If you don't want to use 25-pin to 9-pin convertor to connect
DVS and DTE through RS232 interface, you must use RJ45-DB9 cable.
Its internal connection description is:
(4) When the RS232 interface of the DVS connects with the DCE
(such as MODEM), one end of the cable is the 8-pin RJ45 connector and
User Manual of DS-6000HCI-ATA Net Digital Video Server
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