Ericsson R320s White Paper page 22

The following illustration summarises the methods that are used to switch between the three
infrared modem operating modes.
Lose carrier
or
lose I.R. link
or
press "No"
button
(or pull DTR
low *)
or
ATH
Pull DTR not available
*
when using cable
Figure 6. Methods that are used to switch between the three Infrared Modem operating modes
22
Power up
Off-line Command Mode
Exchange AT command data between
computer and Infrared Modem
Dial
Answer
ATD
ATA
<tel.
no.>
On-line Data Mode
Exchange data or facsimile
with a remote modem
+++AT <?>
(or
pull DTR low *)
On-line Command Mode
Exchange AT command data with the
Infrared Modem while staying on-line
Lose
carrier
or
lose I.R.
link
or
press "NO"
button
(or pull
DTR low *)
ATO