User manual

APPLICATIONS
Section 5
5-2
Copyright (C) Dataplex Pty Ltd
5.3 Asynchronous Modes
Mode 0 Asynchronous
This is the standard default Asynchronous Operating Mode. Enter ATDnnnnnn to dial and
go on-line. DTR modes refer only to actions performed on the falling edge. Dialling is
performed exclusively by AT dial commands. If AT&D0 is set, answering a call takes
place as soon as the ring count in S0 is reached. If DTR is left high, the modem will
answer on the number of rings stored in S0, or, as determined by the AT&D1-3 modes.
ASYNC MODE DTR RISE DTR FALL DTR LOW
AT&M0&D0 Ignore DTR. Ignore DTR. Ignore DTR.
AT&M0&D1 Ignore DTR. On-line Command
State.
Do not answer.
AT&M0&D2 Ignore DTR. Hangup and go to
Command State.
Do not answer.
AT&M0&D3 Ignore DTR. Execute ATZ & hang
up.
Do not answer.
Table 5.1 Mode 0 Asynchronous
Mode 1 Asynchronous
This mode allows the DPX-213 to dial the number stored in location zero on the rise of
DTR. If no dialling is desired, the user should ensure location zero is empty for the
originating modem or have R stored (for reverse mode) in location zero at the answering
end. After a call has been placed by the rise of DTR, the remote modem may disconnect
and the local modem may then be in the DTR high, but in the Off-line State. If this is the
case, the modem will answer after S0 rings.
If DTR is low and the phone is ringing, the "RING" message will be output to the DTE. If
DTR is raised while the phone is ringing, the modem will go on-line in Originate Mode
(provided the S0 count has not been reached), or alternatively, go on-line in Answer Mode
if the S0 value has been passed.
ASYNC MODE DTR RISE DTR FALL DTR LOW
AT&M1&D0 Ignore DTR. Ignore DTR. Ignore DTR (answer
on S0).
AT&M1&D1 Dial number. On-line Command
State.
Do not answer.
AT&M1&D2 Dial number. Hang up and go to
Command State.
Do not answer.
AT&M1&D3 Dial number. Execute ATZ and
hang up.
Do not answer.
Table 5.2 Mode 1 Asynchronous