Siemens SIMATIC TIM 3V-IE DNP3, Системное руководство

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Configuration in STEP 7
5.6 Configuring networks and network nodes in STEP 7 / NetPro
TIM DNP3
110
System Manual, 12/2015, C79000-G8976-C253-04
The AT Initialization tab appears only for dial-up network nodes and when the AT mode is
selected as the Dialing mode in the Dialing parameters tab. The string stored here is formed
automatically from the previously set dial-up network parameters and the SINAUT dial-up
modem selected on the TIM interface.
If "3rd party modem" is set on the TIM interface, no initialization string is displayed. You will
then need to enter the correct string for the modem you are using. The initialization string set
here is transferred to the modem operating in AT mode only when the TIM starts up.
● Initializing string
In the left-hand input box, the AT string is displayed as text and in the right-hand box in
hexadecimal notation. No entries can be made in the right-hand box. In the left-hand box,
a string can only be entered when either no entry can be found for the current
combination of modem and network parameters in the SINAUT modem database or the
User defined option was set. Otherwise the valid string is taken from the database.
● User defined:
This option allows the manual entry of AT Initialization strings for the basic settings of the
modem.
● Type of string:
The content of the current string is shown in this output box.
Special features of the MD4 modem (is no longer available)
On the MD4 modem, the standard string is ATS45=83$P1\N0&W$M=n.
The part string $P1 defines the V.110 mode at a transmission speed of 9600 bps.
The n character at the end of the string is the placeholder for the MSN (last digit of the
telephone number) of the subscriber.
The stored standard string allows only transmission rates of 9600 and 19200 bps, no other
speeds are supported.
When using the MD4 modem in ISDN networks, it is only possible to operate at a
transmission speed of 9,600 bps with the standard setting and not at the maximum speed of
38,000 bps.
If the maximum speed of 38,000 bps is required when using the MD4 in ISDN networks, the
entry $P1 in the default string must be replaced by $P5. This brings about a change from
transmission mode V.110 to the X.75 mode which allows a transmission speed of up to
38,000 bps.
Note
Since the MSN number is automatically added to the generated AT string with the MD4
modem, if you change the telephone number later, remember that the MSN number in the
AT string for the MD4 modem may need to be modified manually.