KBC Networks FDVA4-DB1-M1T-R-WSC - Manual (Page 9)

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and Pull-down resistance should be switched on, the others should be switched off.
② The terminators can be switched on or off according to the RS485 bus connection. When the fiber
transmitter or receiver is placed at the end point of bus, the terminators are usually switched on, but
not be must, so the same as RS422.
Transmitter Right View
Connectors:
DC or AC Power Supply between 12V and 24V can be used on this product.
• DC:
＋ : +12VDC~+24VDC
－ : Power Supply Ground
• AC:
There is no difference between ＋/－; the power supply can be connected into the
device directly.
FIB:
Fiber Optic ST
GND: Grounded pin
LEDs Definition:
POW:
Power Supply. On if power input is in OK.
FIB: Fiber Link. Off if the link is in OK.
V1: ; Channel 1 Video. On if video input is in OK.
V2: ; Channel 2 Video. On if video input is in OK.
V3: ; Channel 3 Video. On if video input is in OK.
V4: ; Channel 4 Video. On if video input is in OK.
D1: 2 wires RS485 Transmit/ Receive Data. Flash if there is activity.
RS232/RS422/ 4 wires RS485 Transmit Data. Flash if there is activity.
D2: RS232/RS422/ 4 wires RS485 Receive Data. Flash if there is activity.