Ronan X501NET - Manual (Page 42)

Chapter 2 - Interface
X501NET System Configuration Manual © 2008 Ronan Engineering Company 36
2.10.2.6 TCP Port Field
The TCP Port field contains the TCP port number used by the X501NET to listen for incoming
connections from the IEC60870 master station.
2.10.2.7 Initial Discovery Port Field
The Initial Discovery Port field contains the UDP port number on which the X501NET
broadcasts the Initial Discovery Datagram
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when no connection exists between it and an
IEC60870 master station. This datagram is broadcast repeatedly until a connection is established.
The datagram contains enough information for an eventual IEC60870 master station to connect
to the X501NET via the IEC60870 protocol.
2.10.2.8 Common ASDU Address Field
The value of this parameter is used for the ASDU Address field of the IEC 60870-5-104 protocol
frames sent from the X501NET to the IEC60870 master station.
2.10.2.9 Originator Address Field
The value of this parameter is used for the Originator Address field of the IEC 60870-5-104
protocol frames sent from the X501NET to the IEC60870 master station.
2.10.2.10 Confirmation Timeout Field
This parameter is the maximum delay in milliseconds for the X501NET to send an activation
confirmation (ACTCON) following an activation request (ACT).
2.10.2.11 Termination Timeout Field
This parameter is the maximum delay in milliseconds for the X501NET to send an activation
termination (ACTTERM) following an activation request (ACT).
2.10.2.12 Window Size (K) Field
Size in KB of the TCP transmit window.
2.10.2.13 Window Size (W) Field
Max number of TCP frames which can be received without the transmission of an ACK frame.
34 This datagram has to be broadcasted because the X501NET doesn’t know in advance the IP address of its
IEC60870 master station.