ME310G1/ME910G1/ML865G1 AT Commands Reference Guide
80617ST10991A Rev.4 Page 188 of 545 2020-04-15
3.3.12. AT+CCHO - Open Logical Channel
Open Logical Channel
AT+CCHO=<dfname>
Execution of the command causes the MT to return <sessionId> to allow the TE to identify a
channel that is being allocated by the currently selected UICC, which is attached to ME.
The currently selected UICC will open a new logical channel; select the application identified by the
<dfname> received with this command and return a <sessionId> as the response.
The ME shall restrict the communication between the TE and the UICC to this logical channel.
The response message of the command is in the format:
+CCHO: < sessionId >
The <sessionId> is described in the Additional info section.
Error case:
+CME ERROR: <err>
Parameter:
all selectable applications in the UICC are referenced by a DF
name coded on 1 to 16 bytes (hexadecimal character format;
refer +CSCS).
<sessionId> returned by the +CCHO command.
session Id to be used to target a specific
application on the smart card (e.g. (U)SIM, WIM,
ISIM) using logical channels mechanism.
Session Id is used when sending commands with
Restricted UICC Logical Channel access
+CRLA, or Generic UICC Logical Channel access
+CGLA commands.