Total Control MP/16, Operator'S Manual

Page: 160 / 182

E-10 Modem Testing
Ending Testing with the Test Pattern
Pressing any character key cancels all test pattern tests and hangs
up the modem. If you used Register S16, be sure to reset Register
S16 to Data mode when you reset the modem to its error control
defaults, for example, ATZ or AT&M4S16=0.
Remote Digital Loopback
 
S16=8
Responding Modem
The responding modem must be ready to act on the modem's RDL
request. U.S. Robotics high-speed modems should be set to &T4.
If they do not have &T testing capability, they should be set to
S16=8.
Initiating Modem
1 If DIP switch 9 is OFF, set it ON so that it does not hang up on
receipt of the +++ escape code. Issue an ATZ command to
initiate the new switch setting.
2
Set the software to 2400 or 1200 bps. The ITU-T-specified RDL
signals are defined only for connections at 2400 or 1200 bps.
3 Disable error control by setting the modem to &M0. Then
establish a connection with the remote modem.
4 Bring the modem back to Command mode by sending it the
escape code: one second of no data, three pluses (+++), and
another second of no data.
5 When the OK result code appears, send the modem the
following command:
ATS16=8 O
The modem enters RDL mode (S16=8), the MR status light
flashes, and the modem goes back online (O command). Then
it transmits the ITU-T-defined RDL signals, causing the remote
modem to enter RDL mode.
6
Type any data at the keyboard. (Or send the test pattern.)
7 To end the test, send the modem the +++ escape code again to
bring it back to Command mode.