HIKVISION DS-8004HCI-S User Manual page 145

3. 25-pin to 9-pin converter internal connection is defined as follows:
Connection for DB25 and DB9:
4. The serial port of the DVR is connected with a DCE device (like a MODEM); one end of
the cable is an 8-pin RJ45 plug. The other end is DB25 pin connector.
Connection for RJ45 and DB25 (DCE)
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