Siemens SIMATIC S7 System Manual page 557

Parameter
Recognize message end by
message timeout
Recognize message end by
response timeout
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05
Definition
The message end occurs when the configured amount of time to wait for the message end
has expired. The message timeout period begins when a start condition has been satisfied.
The default is 200 ms and the range is 0 to 65535 ms.
①
Received characters
②
Start Message condition satisfied: message timer starts
③
Message timer expires and terminates the message
The message end occurs when the configured amount of time to wait for a response
expires before a valid start sequence is received. The response timeout period begins
when a transmission ends and the CM or CB begins the receive operation. The default
response timeout is 200 ms and the range is 0 to 65535 ms. If a character is not received
within the response time period, RCVTIME, then an error is returned to the corresponding
RCV_PTP instruction. The response timeout does not define a specific end condition. It
only specifies that a character must be successfully received within the specified time. You
must configure another end condition to indicate the actual end of a message.
①
Transmitted characters
②
Received characters
③
First character must be successfully received by this time.
105BCommunication processor
12.3 Point-to-Point (PtP) communication
557