49Connection
Echochange - Manual / Connection
49
Ignore TCP End Check
This setting only makes sense for Receive Direct connections.
Option enabled:
Reading in a TCP/IP frame disables its end tag. Thus, the reception buffer passes exactly the
amount of data the PLC user program had requested. When data is read cyclically, this may cause
problems if different data lengths were configured for the “Send Direct” and “Receive Direct” (user
program) jobs.
Option disabled:
(default setting, recommended)
Excess data bytes will be ignored. This setting is only relevant to the currently edited connection
(Receive Direct connection).
Life Acks with Previous Received Data
Same function as for “Life Acks as TCP/IP Standard”
If you enable this option, the data byte received last will be sent back, but with a wrong sequence
number so that the other communication partner replies by sending a life ack with the correct
sequence number.
Send an Ack Immediately after Received Data
It is recommended to enable this parameter if data is transmitted cyclically in a LAN. In most cases,
the TCP/IP protocol collects multiple data blocks before sending an acknowledgment. If you enable
this setting, the acknowledgment (ACK) is sent immediately. This increases the data rate when data
blocks are sent cyclically in short intervals.
Send a Life Data Ack after the last Frame in a Sequence
This option is only available if PLC Header or RFC 1006 is used for communication.
Many socket implementations (socket libraries) do not send the IP acknowledgment frame. If you
enable this function, a life data ack will be returned as an acknowledgment.
Do not Wait for Send Acknowledge
This option is only available if PLC Header or RFC 1006 is used for communication.
Option enabled:
The sending station initiates frames without waiting for the frame acknowledgment (ACK) relating to
the previous frame.
Option disabled:
(default setting)
The sending station waits for the frame acknowledgment (ACK) relating to the previous frame before
sending a new frame.
End Connection with FIN Instead of RST
Option enabled:
As a reply to the end connection frame (FIN), a corresponding end connection frame is sent.
Option disabled:
When a station receives an end connection frame, it resets the connection.
Use the same Port Number for both Ports
This setting sets both the source and the destination ports to the port selected in the
parameterization. This disables the automatic setting of the source port to a value > 1024 in some
devices (see also TCP/IP System Settings). This setting is required for the communication with CPs
that do not correctly handle frame traffic via UDP.
Big Endian Format in the PLC Header
In the PLC header, the sequence number will be transmitted in the MOTOROLA format (big-endian).
Usually (flag not set) the INTEL format (little-endian) is used to transmit the sequence number in the
PLC header.
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