BK8000 | RS485 Bus Coupler

The BK8000 Bus Coupler uses the physics of the RS485 (V.24) specification for data transmission. Application of the Bus Coupler with a serial interface is suited to those cases in which the use of a fieldbus system can be omitted. The RS485 interface can be used by any automation device with the corresponding interface to gain access to the Bus Coupler. Data exchange is made via an open, documented protocol.

Another mode of operation is for the Bus Coupler to function in master/slave mode as a fieldbus multiplexer. The input data from one device are copied directly to the outputs of the other, without the aid of an additional master – and vice versa.

The BK8000 Bus Coupler communicates via an RS485 interface. This permits a bus to be constructed with up to 99 participating devices (addresses can be set with an address selector).

Number of Bus Terminals 64

Max. number of bytes fieldbus 512 byte input and 512 byte output

Digital peripheral signals 512 inputs/outputs

Analog peripheral signals 256 inputs/outputs

Configuration possibility via KS2000

Protocol open, documented protocol

Data transfer rates 9.6 kbaud, 19.2 kbaud, 38.4 kbaud

Bus interface RS485 D-sub

Data transfer medium screened, twisted copper cable 2 x 0.25 mm² (RS485)

Power supply 24 V DC (-15 %/+20 %)

Input current 70 mA + (total K-bus current)/4, 500 mA max.

Starting current 2.5 x continuous current

Recommended fuse ≤ 10 A

Current supply K-bus 1750 mA

Power contacts max. 24 V DC/max. 10 A

Electrical isolation 500 V (power contact/supply voltage/fieldbus)

Weight approx. 170 g

Operating/storage temperature 0…+55 °C/-25…+85 °C

Relative humidity 95 %, no condensation

Vibration/shock resistance conforms to EN 60068-2-6/EN 60068-2-27

EMC immunity/emission conforms to EN 61000-6-2/EN 61000-6-4

Protect. rating/installation pos. IP20/variable

Approvals/markings CE, UL, ATEX, IECEx, DNV GL

Ex marking ATEX: II 3 G Ex ec IIC T4 Gc IECEx: Ex ec IIC T4 Gc

>>> Refer to technical document: bk8000en