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AT Commands Reference
4.16.1.5
System Behavior
The following are the system behavior guidelines while in MUX mode:
• Using the AT+CBAUD and +IPR commands is prohibited while in MUX mode.
• Channels 1 and 2 have the same baud rate and the same hardware flow control.
• Both AT+CMUX and MUX services can be activated without a SIM card (Core AT commands)
• When Channel 1 is in CSD data mode, the connection can be released by sending the +++ sequence, and then sending the
ATH command.
• When Channel 1 is in GPRS data mode, the connection can be released by sending either the +++ sequence, or the ATH
command, or by using the virtual DTR toggle.
• In MUX mode, use the virtual V24 signals as the DTR and DCD hardware signals are not relevant for the MUX protocol.
• AT commands that create unsolicited reports should be set in the MUX mode in order to receive the correct unsolicited AT
command indications (CLCC, CSCB, and so on).
• Activate the +CIPE command before the MUX command in order to receive the correct CIP confirmation in the MUX mode.
• When in CSD data call mode, close the call before exiting the MUX.
4.16.1.5.1 Supported Protocol Services
The following protocol services are supported:
g20 Support Multiplexer ETSI 07.10 - .
Multiplexer Flow Control Service (5.1.8.1.4 in the specifications).
Channel Establishment Services
Purpose: Used to add a new channel.
Usage: Permitted channel ID numbers are 0-2.
Channel Release Services
Purpose: Used to disconnect the existing channel.
Usage: On existing channel.
Data Services
Purpose: Used for data transmissions.
Usage: For data transfer between the g20 and the terminal.
Close Down Services
Purpose: Used to terminate multiplexer 07.10.
Usage: This command can be used if the last existing channel is the control channel (channel 0). The DISC or CLD command
frame can be used for this purpose.
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