Siemens ANSI/UL 1066 Application Manual page 82

Breaker Data Adapter (BDA)
WL Circuit Breaker
Figure 4-10
Installing a standard modem with Windows2000, part 2 (identical to WindowsXP):
Select the standard modem (28800) and assign it to a free COM interface.
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WL PROFIBUS Communication and Electronic Accessories • July 2004