User’s Manual
Arctic IEC-104 Gateway
36
Viola Systems Ltd.
RX window size (w)
Defines the maximum number of I format APDUs the Arctic may receive before sending
acknowledgement to the IEC-104 master.
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)
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.
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)
Defines the timeout in seconds from the last received I format APDU before sending
acknowledgement.
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.