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Optical Data Transmission DeviceSerial type

High performance in compact and light weight of handy size, 44 x 84 x 130.3mm!
Long distance, 100m and 200m!
400m type is also available in the same size!



-> Actual transmission distance is 2 times or more than rated value and data transmission with high reliability is realized.
-> Many kinds of interface are lined up, RS-232C, RS-422, current-loop and RS-422/RS-485 multi-drop, etc.
-> Level lowering warning output is provided due to prevent some troubles such as dislocation of optical axis or dirty lens surface.
-> It can be easy to check optical axis adjustment with optical checker or checking terminal.


Model No. BWF-11A/11B BWF-21A/21B BWF-31A/31B BWF-41A/41B
Transmission distance 100m 200m 100m 200m
Directional angle ±2° ±1° ±2° ±1°
Transmission method Full-duplex two-way transmission
Transmission speed DC to 19.2kbps
Interface RS-232C/RS-422
Modulation method FSK modulation
Modulated frequency A type(Transmission:5.5MHz, reception:6.0MHz), B type(Transmission:6.0MHz, reception:5.5MHz)
Power source 12 to 24VDC(Allowable operating voltage 10 to 30VDC) 100VAC(Allowable operating voltage 85 to 110VAC) 50/60Hz
Current consumption 150mA or less(when 12VDC), 80mA or less(when 24VDC) 40mA
Indications lamps Power source, carrier detect, data input, data output, light-reception level margin(Red LED)
POW(Power lamp): Light-up when power source ON
CD(Carrier detect lamp): Light-up when light-reception, light-reception margin level 1
SD(Data input lamp): Light-up when transmission data input
RD(Data output lamp): Light-up when reception data output
L1(Light-reception level lamp): Light-up when margin 1.5 times
L2(Light-reception level lamp): Light-up when margin 2 times
L3(Light-reception level lamp): Light-up when margin 2.5 times
Warning output (ARM) ON when light-receiving level margin 1.5 times or more and OFF when it is 1.5 times or less, Photo-coupler(35V, 50mA)
Light-reception level output 0 to 5V(in proportion to light-reception amount)
Connection Connector type(D-sub connector with 25-pin), M3 screw terminal for power source
Ambient illuminance 20,000lux or less(sunlight/incandescent lamp)
Ambient temperature/humidity -10 to +50 degrees C, 85%RH or less(not icing)
Protective structure IP60(IEC standard), IP64 is available if option parts are used
Note) Ask us about current-loop and multi-drop interface.

External dimension

External dimension

External dimension

I/O Circuit

Input/output circuit

Input/output circuit


Power terminal(M3 screw terminal)
Make sure to connect +V to terminal at left side for DC power.
DC power provides on connector for interface too. Connect either one.

Connector for interface

Interface Pin No. Symbols Functions
RS-232C 2 SD Transmission data
3 RD Reception data
8 CD Reception carrier detect
21 SD OFF Transmission stop
RS-422 14 +SD Transmission data(+)
15 -SD Transmission data(-)
16 +RD Reception data(+)
17 -RD Reception data(-)
18 +CD Reception carrier detect(+)
19 -CD Reception carrier detect(-)
12 +SRD OFF Transmission/reception stop(+)
13 -SRD OFF Transmission/reception stop(-)
Level 6 LEVEL Light-reception level output
- 7・20 SG(OV) Ground for signal
Warning 4 ARM Warning output (ARM)
Power source 11 +VIN DC Power(voltage 10 to 30VDC)
23 -VIN(OV)
Note) Don`t connect 0V for power source to ground for signal(SG).


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Download List

Category File name File size Date modified Download
instruction Manual_BWF (Japanese and English)