CHAPTER 3: ETHERNET INTERFACE IEC60870-5-104 PROTOCOL
SR3 SERIES PROTECTIVE RELAY PLATFORM – COMMUNICATIONS GUIDE 3-29
□ Transparent file.
□ Transmission of disturbance data of protection equipment.
□ Transmission of sequences of events.
□ Transmission of sequences of recorded analog values.
3.14. File transfer in control direction:
□ Transparent file.
3.15. Background scan:
□ Background scan.
3.16. Definition of timeouts:
Maximum range of values for all time outs: 1 to 255 s, accuracy 1 s.
3.17. Maximum number of outstanding I-format APDUs (k) and latest acknowledge
APDUs (w):
Maximum range of values k: 1 to 32767 (2
15
– 1) APDUs, accuracy 1 APDU.
Maximum range of values w: 1 to 32767 APDUs, accuracy 1 APDU.
Recommendation: w should not exceed two-thirds of k.
3.18. Port number:
3.19. RFC 2200 suite:
RFC 2200 is an official Internet Standard which describes the state of
standardization of protocols used in the Internet as determined by the Internet
Architecture Board (IAB). It offers a broad spectrum of actual standards used in the
Internet. The suitable selection of documents from RFC 2200 defined in this
standard for given projects has to be chosen by the user of this standard.
⊠ Ethernet 802.3.
□ Serial X.21 interface.
□ Other selection(s) from RFC 2200 (list below if selected).
Parameter Default value Remarks Selected value
t
0
30 s Timeout of connection establishment Configurable
t
1
15 s Timeout of send or test APDUs 15 s
t
2
10 s Timeout for acknowledgements in case of no
data messages t
2
< t
1
10 s
t
3
20 s Timeout for sending test frames in case of a
long idle state
20 s
Parameter Default value Remarks Selected value
k 12 APDUs Maximum difference receive sequence number
to send state variable
12 APDUs
w 8 APDUs Latest acknowledge after receiving w I-format
APDUs
8 APDUs
Parameter Value Remarks
Port number 2404 In all cases
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