Eicon Technology DIVA T/A ISDN Modem Reference Manual page 58

Register Description
S25 Data Terminal Ready Detection Delay. Specifies the duration that the Data
Terminal Ready (DTR) status must either be raised or dropped before being
recognized by the DIVA T/A. This delay helps ensure that the DIVA T/A does not
interpret a random glitch as a DTR raise or drop.
This register affects the AT&Dn command, which controls interpretation of the Data
Terminal Ready (DTR) input (see page 37). Essentially, detection by AT&Dn will be
delayed according to the S25 register setting.
Range: 0-255, in tenths of a second. For example, if set to 5, the duration is five-tenths
of a second, or 50 milliseconds.
Default: 0. Type: Storable.
DIVA T/A ISDN Modem Reference Guide N Page 58
S-Register Commands