Siemens SIMATIC S7-1200 CP 1243-8 IRC Operating Instructions Manual page 88

Configuration
4.9 Serial interface
AT initialization
● User-defined
If the option is enabled the AT initialization string for the basic settings of the modem can
be assigned manually.
If the option is disabled, the AT initialization string is preset for the specific modem:
– MD3 : ATS45=3\N0F0&W
– MD4 : ATS45=83$P1\N0&W
– MD720 : For information on the initialization string, refer to the manual /8/ (Page 227).
● AT string
Input box for the AT initialization string
Transmission setting for conditionally spontaneous frames
● Transmission criterion
Only for interfaces with the Network node type "Station" / "Node station".
The transmission criterion controls connection establishment for the transmission of
conditional spontaneous frames. This reduces the number of connection retries.
Range of values:
– Standard conditions
– Degree of filling
– Time
– Time scheme
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No connection will be established due to the existence of conditional spontaneous
frames.
Only in the following cases will a connection be established to send conditional
spontaneous frames.
- Threatened overflow of the send buffer
- Connection establishment by the communications partner
The CP only establishes a connection when the configured fill level of the send buffer
for conditional spontaneous frames is exceeded.
In the input box, enter the fill level (%) of the send buffer at which when exceeded the
CP establishes a connection.
The CP sends conditional spontaneous frames at a time of day, configurable with
"Hours" / "Minutes".
The CP sends the conditional spontaneous frames cyclically at an interval,
configurable with "Hours" / "Minutes".
Operating Instructions, 02/2018, C79000-G8976-C385-03
CP 1243-8 IRC