User`s manual

User's Manual
Arctic IEC-104 Gateway
Firmware Version 5.0.9 51 Document Version 1.5
Table 17: IEC-104 RX windows size (w)
IEC-104 RX windows size (w)
Type Window size
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 18: 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 19: 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 20: IEC-104 link test interval (t3)
IEC-104 link test interval (t3)
Type Timeout