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Page 153
AT%F DTR/DSR override
Front panel Option switches 1 and 2 may be used to control the DTR and DSR signals, or select
V.25bis operation.
Refer to the Dumb Mode section for details
Options
AT%F0 A & B switches control V.25bis function
AT%F1 ■ Switch A forces DTR on, Switch B forces DSR high
Range
0-1