GE MiCOM P40 Agile Technical Manual

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SCADA Communications P44x/EN SC/Hb6MiCOM P40 Agile P442, P444 (SC) 12-152 COURIER INTERFACE2.1 Courier protocolK-Bus is based on EIA(RS)485 voltage levels with HDLC FM0 encoded synchronoussignalling 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 fortemporary local connection and is not suitable for permanent connection. This interface usesa 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 voltagelevels it is a synchronous HDLC protocol using FM0 encoding. It is not possible to use astandard 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 protocolconverter, such as the KITZ101, should be employed for this purpose.Alternatively for direct connections, the fibre optic converter card may be used to convert therear EIA(RS)485 port into a fibre optic (ST) port.2.2 Supported command setThe following Courier commands are supported by the relay:Protocol LayerReset Remote LinkPoll StatusPoll Buffer*Low Level CommandsSend Event*Accept Event*Send BlockStore Block IdentifierStore Block FooterMenu BrowsingGet Column HeadingsGet Column TextGet Column ValuesGet StringsGet TextGet ValueGet Column Setting Limits