54
Connection
54
Echochange - Manual / Connection
Sending / Receiving Data
When sending data over the S5 TCP/IP, a frame can include a maximum payload of 512 bytes. This
maximum value is preset by the default tile block size. Received data packets can contain up to
1460 bytes. These limits are monitored automatically by the TCP/IP protocol so that no monitoring is
required on the user side.
Transmission without Frame Header
The header at the beginning of the frame may be disabled. In this case, the application programs on
both sides are responsible for monitoring. In this context, please note the following:
1. In particular with Send Direct and Receive Direct jobs, certain time limits until frame receipt must
not be exceeded. If these time limit were ignored, the internal buffers would be full, e.g. due to
requests. Thus, it would be impossible to synchronize request and response.
2. A certain blocked data transmission mechanism must be used so that it is possible to recognize
the end of payload.
3. On the recipient side, you need to make sure that the frames from the reception buffer have been
read before the partner station sends the next frame.
It is mandatory to set up connection monitoring in the application program.
8.2.4 H1 Connect Parameters
In this dialog box, you can edit the H1 parameters.
Name of the Connection
You can choose any connection name you like. All characters except brackets may be used.
Adapter
Here, you can specify the number of the Ethernet adapter used to establish the H1 connection.
Destination MAC
Each Ethernet station is addressed using a unique MAC address (also referred to as Ethernet
address or hardware address). Enter the Ethernet address of the destination station here. The
destination address consists of 6 bytes (to be entered in hexadecimal notation).
NOTE:
In a single network, each station must have a unique Ethernet address.
Own TSAP, Dest TSAP
TSAPs (Transport Service Access Points) are addresses that are used on the transport layer in order
to address applications. To connect, enter the local TSAP into the Own TSAP field and the TSAP of
the communication partner into the Dest TSAP field. In this context, please note the following:
NOTE:
In order to be able to establish the connection, the value in the Own TSAP field of one
system must match the Dest TSAP value in the other system, i.e. they must match
crosswise.
More detailed information on TSAPs
TSAPs for S7 Connections
CR Parameters
With ISO (H1) connections, a transport connection is established. For this purpose, an active
transport instance sends a CR TPDU (Connection Request Transport Protocol Data Unit) signaling
that it wants to connect. This CR TPDU is used to send some parameters to the partner, such as the
desired TPDU size, the TPDU format, and others. Since there is no standard CR parameter
definition, please refer to the operating instructions of the destination system to find out which
parameters you need to specify here, if any. If no information is available, do not enter any CR
parameters.
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