Hongdian H3324 4CH HDD MDVR - Manual (Page 20)

2 -10
10 12V_OUT To power other device（ Power supply current (less
than 1A)
11 Speed_IN Connect external speed censor, support sine wave
or square wave input
12 GND Ground
13 PC_TX1 Received Data （RS232）
14 PC_RX1 Transmitted Data（RS232）
15 GND Ground
16 PC_TX2 Received Data（RS232）
17 PC_RX2 Transmitted Data（RS232）
18 GND Ground
19 RS485_B‐ 485‐ signal（RS485）
20 RS485_A+ 485+ signal（RS485）
21 GND Ground
22 RS485_B1‐ 485‐ signal（RS485）
23 RS485_A1+ 485+ signal（RS485）
24 5V_OUT To power other device（ Power supply current (less
than 1A)
AV input/output port
AV IN plug cable