US Robotics 3CP5613 User Manual page 74

S Registers
Note: To change a setting use ATSr=n, where r is the register and n is a decimal value from 0
Register Default Function
S16 0 Reserved
S17 0 Reserved
S18 0 Test timer for &T loopback testing. Sets the time in seconds of testing before the modem automatically times out and terminates
the test. When set to 0, the timer is disabled. Valid range is 1-255.
S19 0 Sets duration, in minutes, for inactivity timer. This timer activates when there is no data activity on the phone line; at time-out
the modem hangs up. S19 = 0 disables the timer.
S20 0 Reserved
S21 10 Sets length, in 10-millisecond units, of breaks sent from the modem to the computer; applies to MNP or V.42 mode only.
S22 17 Stores ASCII decimal code for the XON character.
S23 19 Stores ASCII decimal code for the XOFF character.
S24 0 Reserved
S25 20 Sets duration, in hundredths of a second, of a true DTR drop. Prevents modem from interpreting random glitches as DTR loss.
(Most users will use the default; this register is useful for compatibility with older systems and operating software.)
S26 0 Reserved
8-16
T R
ECHNICAL EFERENCE
255 (unless otherwise indicated).