BGS2T AT Command Set
4.3 AT&D
BGS2T_ATC_V01.301
Page 96 of 554
1/31/12
c
4.3
AT&D Set Data Terminal Ready (DTR) Line Mode
determines how the ME responds if the DTR line is changed from ON to OFF state during data connection
(CSD or PPP or active Internet service opened with
Syntax
Parameter Description
[0]
ME ignores status of the DTR line.
1
ON->OFF on DTR: Change to command mode while retaining the data con-
nection.
2
(&F)
ON->OFF on DTR: Disconnect the data connection (only for CSD and PPP)
and change to command mode. For Internet service the behaviour is like
1. During OFF state of the DTR line the auto-answer function (see
)
is disabled.
Notes
•
DTR toggling is effective only when the ME is not in power saving state (i.e. when CTS is asserted). This
means DTR toggling is always applicable if
=1 is enabled. In CYCLIC SLEEP mode, however, some
further steps may be necessary, especially when the ME has entered power saving state after the last UART
communication.
-
In
=9 mode, first toggle the RTS line (inactive/active transition) to temporarily wake up the ME
from power saving and wait until CTS goes active. Afterwards DTR toggling is working as described for
1 and 2.
-
=7 mode, RTS has no wakeup function. Therefore, the application shall poll the CTS line. The
DTR line can be toggled when CTS is active.
See
"BGS2T Hardware Interface Description, Version 01.301"
for details on CTS0 timing and on SLEEP
Mode.
Exec Command
AT&D
]
Response(s)
OK
PIN ASC0 MUX1 MUX2 MUX3
Last
Reference(s)
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+
+
+
+
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V.250
<value>
(num)(&W)(&V)
Confidential / Released