Cinterion
®
ENS22-E AT Command Set
7.10 AT^SIST
ENS22-E_ATC_V01.000
19/02/11
Page 116 of 189
7.10
AT^SIST Enter Transparent Mode
activates / deactivates Transparent Mode.
After entering the
command, the CONNECT response notifies that the service has entered Transpar-
ent Mode and is ready to transparently send and receive payload data over the AT command interface.
There are several ways to quit the Transparent Mode and revert to AT Command Mode:
•
escape sequence
• DTR ON-OFF transitions (see
for configuring DTR line)
• "etxChar" parameter set within the server address (see
vice URLs.
Switching back and forth between both modes does not affect the underlying socket and has no influence on the
service
If the service is in AT Command Mode the "
: x, 1" URC appears once to indicate that the remote side has
sent new data. In this case, the client shall enter
to go to Transparent Mode and read out the new data.
If the connection is released by the remote side or the network is unavailable, the following applies:
• If the service is in Transparent Mode (CONNECT mode): UE returns to AT Command Mode, issues a specific
"NO CARRIER" result code and goes to
6 ("Down") in case of UDP Client. The "NO CARRIER"
result code starts with 0x10 (DLE) and 0x04 (EOT) and ends with the command line termination character
(
), followed by the response formatting character (
).
• If the service is in AT Command Mode the "
: x, 1" URC appears to indicate that the state of the service
has changed. In this case, the client shall go to Transparent Mode with
in order to read remaining
data (if any) and get the "NO CARRIER" result code. After this, the service changes to
("Down"). Otherwise, if the client does not go to Transparent Mode after receiving "
: x, 1" URC the ser-
vice remains in
4 ("Up") even though the remote side has shut down.
In some cases, depending on the remote side and the network, it is possible that "
" URCs may be
reported, for example "
" URCs with
15 ("Remote host has reset the connection") and 19
("Socket has been shut down). See Section
• In all above scenarios, the Transparent service shall be closed with
. Trying to return to Transparent
Mode with
would only end up with "NO CARRIER" once again and is not recommended.
• Use
and
to check the
Syntax
Test Command
AT^SIST=?
Response(s)
OK
Write Command
AT^SIST=
Response(s)
CONNECT
(indicates that UE has entered Transparent Mode)
OK
ERROR
+CME ERROR:
<err>
PIN Last
-
+