Operating Instructions

15
RS485 Data In/Output Terminal
Control data is transmitted and received to and from other peripherals.
For the farthest camera from RS485 convertor, set the RS485 terminal select switch to RS485
LINE TERM, or Hi-Z for other cameras.
Switch Function
Switch position
Right Hi-Z
Left Terminal resistor
Note:
•
Wire gauge size is thicker than AWG#22 (0.325 mm
2
)
•
Because the existence of potential difference with the devices in long distance, communications
may be abnormal. Use the same GND line or an RS485 isolator (locally procured).
5
Turn on the power.
Important:
•
The power supply of 12 V DC shall be insulated against 220 to 240 V AC.
Connect the power supply of 12 V DC:
1
Loosen the screw of the power cord plug (accessory).
2
Connect the power supply of 12 V DC to the power cord plug.
Strip the end of the wire by 3 mm to 7 mm, and twist the stripped part of the wire
sufficiently to avoid short circuit.
Calculation of the relation among the cable length, resistance, and power supply.
The voltage supplied to the camera shall be between 10.8 V DC and 16 V DC.
10.8 V DC
≤
V
A
- 2 (R x I x L)
≤
16 V DC
L: Cable length (m)
R: Resistansce of copper wire (
Ω
/m)
V
A
: DC output voltage of power supply unit
I: DC current consumption (A) See specifications
Resistance of copper wire [at 20 ˚C]
Copper wire size
(AWG)
#24
(0.205 mm
2
)
#22
(0.325 mm
2
)
#20
(0.519 mm
2
)
#18
(0.833 mm
2
)
#16
(1.307 mm
2
)
Resistance
Ω
/m 0.083 0.052 0.033 0.020 0.013
B
A
Data
Transmission
Data
Reception
T(B)
T(A)
R(B)
R(A)
<Half duplex>