User`s manual

User's Manual
Arctic IEC-104 Gateway
Firmware Version 5.0.9 52 Document Version 1.5
IEC-104 link test interval (t3)
Units Seconds
Value range 1-65000
Note Adjust this parameter according to the criticality of the link. The
IEC-104 standard suggests 20 seconds but for pay-per-use GPRS
connections the practical value may be substantially longer.
Suspended timeout
This defines the time in seconds how long a connected IEC-104 link can be in
suspended state (STOPD) before the Arctic closes the connection.
Table 21: IEC-104 suspended timeout
IEC-104 suspended timeout
Type Timeout
Units Seconds
Value range 1-65000
Note Using this parameter increases the probability of detecting partially
closed network connections especially in UDP mode.
Max sequence number
These are the maximum sequence number used in IEC-104 communication.
The value zero selects the standard value 32767.
Table 22: IEC-104 suspended timeout
IEC-104 suspended timeout
Type Sequence number
Units Packets
Value range 1-32767
Note 0 = 32767 as suggested by the IEC-104 standard.
Cause of transmission length (IEC-104)
It defines the length of IEC-104 Cause of transmission ASDU header field in
bytes.
Table 23: IEC-104 ASDU cause of transmission length
IEC-104 ASDU cause of transmission length
Type Field length
Units Bytes
Value range 1-3
Note The IEC-104 standard defines value 2.