User`s manual

User's Manual
Arctic IEC-104 Gateway
Firmware Version 5.0.9 50 Document Version 1.5
New connection priority for IEC-104 connections
Value range No, Yes
Note It is recommendable to set this value to “Yes” in normal
configurations having only one IEC-104 master.
7.4 IEC-104 Settings
The IEC-104 settings define the properties of IEC-104 link layer and
application layer parameters as described in the IEC 60870-5-104 standard.
The IEC-104 communication is carried out between the Arctic and the IEC-104
master over the TCP/IP network.
Figure 37. IEC-104 Settings
TX window size (k)
TX window size defines the maximum number of I format APDUs the Arctic
may send before requiring the IEC-104 master to acknowledge them. If there
are k unacknowledged frames sent the Arctic will stop polling IEC-101 slave
for events until acknowledgement is received.
Table 16: IEC-104 TX windows size (k)
IEC-104 TX windows size (k)
Type Window size
Units Packets
Value
range
1-20
Note The k must be always less than the maximum sequence number
defined below. The IEC-104 standard suggests k to be 12.
RX window size (w)
It defines the maximum number of I format APDUs the Arctic may receive
before sending acknowledgement to the IEC-104 master.