GE Multilin F650, Instruction Manual

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APPENDIX F: IEC 60870-5-103 PROTOCOL F.1 IEC 60870-5-103 PROTOCOL
GEK-106310-AF F650 DIGITAL BAY CONTROLLER f-7
F.1.2 Application level
1. Application Functions
The unbalanced transmission mode of the protocol is used to avoid the possibility that more than one protection
equipment attempts to transmit on the channel at the same time, over the RS485 backside port.
Data is transferred to the primary or control station (master) using the "data acquisition by polling" principle. Cyclically, the
master requests class 2 data to the secondary station (slave). When slave has class 1 data (high priority) pending, the ACD
control bit is set to 1 demanding the master to request for that data. Periodically, the master can send a General
Interrogation in order to update the complete database.
The measurands are sent to the primary station as a response to a class 2 request. There is a setting (0-60 min) in order to
configure the desired interval, where 0 means transmission as fast as possible.
The following functions are supported:
•
Initialization
• General Interrogation
• Synchronization
• Commands transmission
2. Type identification
The implemented Type Identification values are listed below:
TYPE IDENTIFICATION UI8[1..8] <1..255>
<1..31> := definitions of this companion standard(compatible range)
<32..255>:= for special use (private range)
Information in monitor direction:
<1>:= time-tagged message
<3>:= measurands I
<5>:= identification
<6>:= time synchronization
<8>:= general interrogation termination
<9>:= measurands II
Information in control direction:
<6>:= time synchronization
<7>:= general interrogation
<20>:= general command