ProSoft Technology 5105-103M-PDPS - Manual (Page 109)

5105-103M-PDPS ♦ ProLinx Gateway Reference
IEC 60870-5-103 Master to PROFIBUS Slave Gateway User Manual
ProSoft Technology, Inc. Page 109 of 144
November 24, 2010
TYPE 20: General command
Bytes Description Spec
1 Value of 20
1 0x81
1 COT
1 Common address of ASDU
1 Function Type
1 Information number
1 DCO (1=Off, 2=On) 7.2.6.4
1 RII 7.2.6.19
RII is not to be processed within the protection equipment, but to be used as a
SIN of the return message.
3.2.2 PDPS Protocol Implementation
Module Internal Database
The internal database is central to the functionality of the module. This database
is shared between all the ports on the module and is used as a conduit to pass
information from one device on one network to one or more devices on another
network. This permits data from devices on one communication port/network to
be viewed and controlled by devices on another port/network. In addition to data
from the slave port, status and error information generated by the module can
also be mapped into the internal database.