User Manual
Arctic Substation Gateway
Firmware Version 2.4.x
39
Document Version 1
IEC-104 RX windows size (w)
Units
Packets
Value range 1-20
Note
The w should not exceed two-thirds of TX window size k. The IEC-104
standard suggests w to be 8.
I frames TX timeout (t1)
It defines the timeout in seconds the Arctic waits for acknowledgement from
IEC-104 master after sending last I format APDU or control frame (e.g. link
test). If no acknowledgement is received during the defined time the Arctic will
close the network connection and the IEC-101 link.
Table 30: IEC-104 I frames TX timeout (t1)
IEC-104 I frames TX timeout (t1)
Type
Timeout
Units
Seconds
Value range
1-255
Note
The t1 must be longer than the network round-trip-time. The
IEC-104 standard suggests 15 seconds.
I frames RX timeout (t2)
This defines the timeout in seconds from the last received I format APDU
before sending acknowledgement.
Table 31: IEC-104 I frames RX timeout (t2)
IEC-104 I frames RX timeout (t2)
Type
Timeout
Units
Seconds
Value range
1-255
Note
The t2 must be smaller than t1. The IEC-104 standard suggests 10
seconds.
Link test interval (t3)
This defines the interval in seconds how often the IEC-104 link is tested if
there is no other activity.
Table 32: IEC-104 link test interval (t3)
IEC-104 link test interval (t3)
Type
Timeout
Units
Seconds
Value range
1-65000