NAL Research Corporation (451-93156-002A)
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The A3LA-RM is capable of accepting mobile terminated data calls. The following is a sequence of
commands that can be used to establish the connection.
D.9 Disconnecting a Data Call
D.10 Coordination of +CLCC and +CPAS responses
In order to determine the call state of the A3LA-RM, the +CLCC and +CPAS commands may be used.
The following table demonstrates how the output of the two commands, as well as the Extended Ring
Message, can be combined to provide a more detailed definition of the call state than any one of the results
provides by itself.
To A3LA-RM
(from DTE)
To DTE (from A3LA-RM)
Description
RING
Indicates arrival of call request
ATA
Manually answer the call
CONNECT 9600
Call connected at DTE rate of 9600
ATS0=2
To automatically answer a call, register 0
should be set to a non-zero value
RING
Indicates arrival of call request
CONNECT
Call connected at DTE rate of 9600
To A3LA-RM
(from DTE)
To DTE (from A3LA-RM)
Description
AT+CBST=6,0,1
Asynchronous modem 4800 bps and IRLP
OK
AT+CR=1
Enable reporting
OK
ATD1234567890
Dial remote modem
OK
+CR: REL ASYNC
Call connected at DTE rate of 9600
CONNECT ASYNC 9600
…
…
Data transfer
<+++>
Send escape sequence
OK
ATH0
Hang up call
OK
Call State
+CLCC Response
+CPAS Response
Extended Ring
Message
Idle
+CLCC: 006
+CPAS: 000 or 003
n/a
