Siemens SIMATIC TeleControl DNP3 Configuration Manual page 44

Configuration
3.6 Serial interface
Only for interfaces with the Network node type "Station" / "Node station".
● Max. number of spontaneous frames
The parameter decides after how many frames the master station has the opportunity of
transferring its pending frames to the station. As maximum, the configured number of
spontaneous frames that are pending at the time of the first call frame are transferred.
Default setting: 200. Permitted range: 0...255
If 0 (zero) is set, all spontaneous frames are sent at the call.
● Limit for locked frames
Frames are marked as locked when they cannot be transferred to the communications
partner due to communication problems.
The parameter specifies the maximum quota of locked frames in the send buffer. If the
value is exceeded, the image procedure is used for new frames to prevent the send
buffer from overflowing.
Default setting: 50. Permitted range: 0...90
If 0 (zero) is set, all spontaneous frames are sent at the call.
Connection establishment
Only configurable with: TIM 3V-IE DNP3 / TIM 4R-IE DNP3
● Extra transmission time
Time offset with slow networks to prevent premature canceling of connection
establishment.
Default setting: 10. Permitted range: 0...65535 ms
With the setting 0 (zero), the function is disabled.
In dedicated line networks, the value is usually 0.
Time options
● RTS/CTS delay time
The RTS/CTS delay (ms) can be required when a modem is connected via a serial
interface.
Default setting: 0. Permitted range: 0...65535 ms
– Value = 0
– Value > 0
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After setting the RTS signal, (turn transmitter on) transmission only starts when the
CTS signal (Clear To Send) was set by the modem.
Transmission is not delayed until the CTS signal of the modem.
After the RTS signal has been set, transmission is delayed for the configured time and
then started immediately.
Configuration Manual, 11/2018, C79000-G8976-C508-01
Configuration - DNP3