BF-850 USB/RS-485/422 Converter
Developing by PC industry, USB interface replacing many kind of old PC interface step by step. However, many types of important equipment still use RS-422/RS-485 interface, in order to transfer the data between PC and RS-422/RS-485 interface. That’s why we need to use USB/RS-422/485 converter.
BF-850 is a converter in common use; it does not need extra power. It also conforms to the standard of USB, RS-422 and PR-485, and be able to transfer USB signal to RS-422 or RS-485 signal. There has no delay automatic transfer inside, the unique I/O electric auto-control the direction of data transfer, and need no handshake signal (like RTS, ETR) to transfer with full duplex (RS-422) and half duplex (RS-485).
BF-850 can provide the reliable connection between point to point and point to multi-points. In point to multi-points each converter can connects 32 units of RS-422 or RS-485 interface equipment. The speed of data transfer is 300~921600 bps and the communication types are USB to RS-422, USB to RS-485.
Property Argument | Connection and Signal
Property Argument
•
 Standard: Conform to the standard of USB V1.1, EIA RS-485, RS-422.
•
 USB signal: VCC, DATA+, DATA-, GND, FG
•
 RS-485 signal: T+, T-, GND
•
 RS-422 signal: T+, T-, R+, R-, GND
•
 Communication type: Asynchronous communication, Point to point or point to multi-points, 2 lines
  of halt-duplex, 4 lines of full-duplex.
•
 Communication control: use auto-control technology to transfer the data, automatic determine
  and control the direction of data transfer.
•
 Baud Rate: 300~921600 bps, automatic detect the serial port speed.
•
 Load ability: In point to multi-points each converter can connects 32 units of RS-422 or
  RS-485 interface equipments.
•
 Communication distance: RS-422/RS-485 5000 meter (9600 bps), USB less than 5 meter
•
 Type of communication line：Double twist line or cover line.
•
 Communication speed: 921600 bps 300 M 38400 bps 2.4 KM 9600 bps 5 KM
•
 Support Windows95/98/2000/xp/Windows vista/Windows 7
•
 Surge Protection: 15 KV ESD for all signals
•
 Operation environment: -25 ~ 70℃, humidity 5% ~ 95%
•
 Power Supply: USB 30 mA @DC5V
•
 Weight: 80g.
•
 Dimension: 55 × 36 × 18 mm
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Connection and Signal
•
 RS-422/RS-485 export signal
 
DB9 PINS
Output
RS-422 Duplex
RS-485 Half Duplex
1
T/R+
Transfer(A+)
RS-485(A+)
2
T/R-
Transfer(B-)
RS-485(B-)
3
RXD+
Receive(A+)
Empty
4
RXD-
Receive(B-)
Empty
5
GND
Ground
Ground
6
N/A
-
-
7
N/A
-
-
8
N/A
-
-
9
N/A
-
-
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