User`s manual

U.S. Robotics I-modem Command Reference
Testing • Page 14-4
7. Send AT&M4, unless you used a reset command (ATZ or ATZ!).
Stopping a Test (&T0, S18)
To stop a test, send an &T0 command, or set Register S18 to a speciÞed number of sec-
onds (for example, S18=10). When the
10 seconds are up, the I-modem will stop the test automati-cally and return to Command
mode. Send an ATH command to hang up the I-modem, or an ATZ command to hang up
the I-modem and reset it to its defaults.
Note If you use the S18 test timer, but in the pro-cess of testing you issue an ATZ
command, S18 resets to zero and the timer is disabled. You cannot store a
value for S18 in NVRAM
; its power-on and reset default is always zero.