ProSoft Technology 5201-DFNT-104C - Manual (Page 74)

Mailbox Feature (x201-DFNT-104C) 104C Version 3 ♦ ProLinx Gateway
Protocol Manual IEC 60870-5-104 Client (Firmware v3.xx)
Page 74 of 139 ProSoft Technology, Inc.
August 4, 2011
Mailbox Response
Word Offset in
Block Data Field(s) Description
0 Mailbox ID This field contains the value of -9903
or 9903 identifying the block type to
the module.
1 Event Count This field contains the number of
events present in the block. Values
of 0 to 4 are valid.
2 to 15 Event 1 Event message
16 to 29 Event 2 Event message
30 to 43 Event 3 Event message
44 to 57 Event 4 Event message
58 to 60 Spare Not Used
61 Event Count
Remaining Number of events still present in the
event queue after removing these
events.
62 Event Overflow This flag will be set if the event buffer
overflowed since last reported.
63 Mailbox ID This field contains the value of -9903
or 9903 identifying the block type to
the module.
The format of each 14 word data region in the block is as
follows:
Word Offset Definitions Description
0 Session Index This field contains the session index
used to define the controlled unit in
the module from which the event was
generated.
1 Sector Index This field contains the sector index
used to define the database within the
controlled unit from which the event
was generated.
2 COT This field contains the COT for the
event message received from the
IED. If the size of the COT is a single
byte, the originator address will
always be zero. The COT is in the
LSB and the originator address is in
the MSB.