Step #4 - Enabling End-to-End Data Transmission
If you have performed steps 1 thru 3 correctly, all four serial
devices (two at the local end and two at the remote end) should be set
up to communicate with each other as if they were connected back to
back. (Note: be certain that the remote devices are turned on and that
all physical connections are made properly.) To enable end-to-end data
transmission, follow these instructions:
1) Key AT[D0 to go from Remote Online Command Mode to Local
Online Command Mode. The unit responds “OK”.
2) Key AT[O to go from Local Online Command Mode to Online
Data Mode. The unit will not issue a response because it is no
longer in a command mode.
Step #5 - Ending the Connection
If you have performed steps 1 thru 4 successfully, your four serial
devices should be able to communicate across the modem link. If this
is not happening, consult Section 7.0 Troubleshooting. The only
remaining step is to end the connection. Follow these instructions:
1) Key \\\ to go from Online Data Mode to Local Online Command
Mode. The unit responds “OK”.
2) Key AT[H to hangup/disconnect the modem link and return to
Local Offline Command Mode. The unit responds “OK”.
3) When the local modem is powered down, the Model 3022 will
power down as well. Any configuration changes you have entered
will be stored in the Model 3022’s non-volatile memory if they have
been saved with the AT[W or AT@W command.
21
22
7.0 TROUBLESHOOTING
SYMPTOM
POSSIBLE PROBLEM
SOLUTION
1. ERROR
response to AT[Y0
command
2. ERROR
response to AT[H
command
3. Model 3022
does not respond to
\\\ command
4. Keying
garbage/incorrect
characters
5. No responses to
keying appears on
screen; 3022
appears to be
'locked up'.
Model 3022 is in
PassThru Mode
Model 3022 is in Local
Online Command
Mode
Model 3022 is in Local
Offline Command
Mode
Model 3022 is in Pass-
Thru Mode
Model 3022 is already
in Local Online
Command Mode
Model 3022 is already
in Local Offline
Command Mode
Bit rate mismatch on
connected
channel
3022 has timed out
and is waiting to go
into Online Data Mode
Kill Time Out (Kn) may
be too short
Enter \\\ to return to
Local Offline
Command Mode
Key AT[H to enter
Local Offline
Command Mode, then
re-enter AT[Y0
Model 3022 is already
in default Mode. Re-
initiate start-up
sequence.
Model 3022 does not
need disconnection
Issue AT[O to resume
Online Data Mode and
proceed with data
transfer. Then issue \\\
and AT[H to hang up.
Model 3022 is already
in default mode.
Change bit rate of
connected device and
key characters until
characters keyed are
the same as on-screen
characters.
Key \\\ to re-enter Local
Online Command
Mode. Then key AT[H
to re-enter Local
Offline Command
Mode.
Lengthen Kill Time Out
(Kn command)
