P44x/EN SC/Hb
P442, P444 (SC) 12-
2 COURIER INTERFACE
2.1 Courier protocol
K-Bus is based on EIA(RS)485 voltage levels with HDLC FM0 encoded synchronous
signalling and its own frame format. The K-Bus twisted pair connection is unpolarized,
whereas the EIA(RS)485 and EIA(RS)232 interfaces are polarized.
The EIA(RS)232 interface uses the IEC 60870-5 FT1.2 frame format.
The relay supports an IEC 60870-5 FT1.2 connection on the front-port. This is intended for
temporary local connection and is not suitable for permanent connection. This interface uses
a fixed baud rate, 11-bit frame, and a fixed device address.
The rear interface is used to provide a permanent connection for K-Bus and allows multi-
drop connection. It should be noted that although K-Bus is based on EIA(RS)485 voltage
levels it is a synchronous HDLC protocol using FM0 encoding. It is not possible to use a
standard EIA(RS)232 to EIA(RS)485 converter to convert IEC 60870-5 FT1.2 frames to K-
Bus. Nor is it possible to connect K-Bus to an EIA(RS)485 computer port. A protocol
converter, such as the KITZ101, should be employed for this purpose.
Alternatively for direct connections, the fibre optic converter card may be used to convert the
rear EIA(RS)485 port into a fibre optic (ST) port.
2.2 Supported command set
The following Courier commands are supported by the relay:
Protocol Layer
Reset Remote Link
Poll Status
Poll Buffer*
Low Level Commands
Send Event*
Accept Event*
Send Block
Store Block Identifier
Store Block Footer
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