ARM Electronics NDVR16 - Manual (Page 42)

2. DVR system
Notice: RS-232C is for company R&D debug testing, no useful for user.
PIN No. Definition
1 DCD
42
2 RXD
3 TxD
4 DTR
5 GND
6 DSR
C o m m P o r t
RS-232C
1 5
6 9
7 RTS
8 CTS
9 NC