The K-Bus signal is a differential signal and there is no signal ground connection. If a signal ground
connection is present in the bus cable then it must be ignored. At no stage should this be connected to the
cable's screen or to the product’s chassis. This is for both safety and noise reasons.
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. A protocol converter, namely the KITZ101, KITZ102 or KITZ201, must be used for this
purpose. Please consult Alstom Grid for information regarding the specification and supply of KITZ devices.
The following figure demonstrates a typical K-Bus connection.
IED IED IED
K-BusRS232
KITZ protocol converterRS232-USB converterComputer
V
01001
Figure 48: Remote communication using K-Bus
Note:
An RS232-USB converter is only needed if the local computer does not provide an RS232 port.
Further information about K-Bus is available in the publication R6509: K-Bus Interface Guide, which is
available on request.
MiCOM P747 Chapter 7 - SCADA Communications
P747-TM-EN-1 197
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