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Section 5
RER601/603 Configurator
50
Table 17:
IEC 60870-5-104 TX window size (k)
Description
Type
Units
Value range
Note
RX window size (w) defines the maximum number of I format APDUs the device
may receive before sending an acknowledgement to the IEC 60870-5-104 master.
Table 18:
IEC 60870-5-104 RX window size (w)
Description
Type
Units
Valule range
Note
I frames TX timeout (t1) defines the time-out in seconds the device waits for an
acknowledgement from the IEC 60870-5-104 master after sending the last I format
APDU or a control frame, such as a link test. If no acknowledgement is received
during the defined time, the device closes the network connection and the IEC
60870-5-101 link.
Table 19:
IEC 60870-5-104 I frames TX time-out (t1)
Description
Type
Units
Value range
Note
I frames RX timeout (t2) defines the time-out in seconds from the last received I
format APDU before sending an acknowledgement.
Value
Window size
Packets
1...20
The value "k" must always be less than the
maximum sequence number defined below. The
IEC 60870-5-104 standard suggests k = 12.
Value
Window size
Packets
1...20
The value "w" should not exceed two-thirds of
the TX window size "k". The IEC 60870-5-104
standard suggests w = 8.
Value
Timeout
Seconds
1...255
The value "t1" must be longer than the network
round-trip time. The IEC 60870-5-104 standard
suggests t1 = 15 seconds.
1MRS757105 B
RER601/603
Technical Manual
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