Qualcomm GSP-1620 specifications Port Activation DTR Changes during Operation

Developing Modem Applications

Table 5-4. Port(s) Affected by AT Commands (continued)

		Port Command Applies To:
AT Command	AT Command	Data Port	Control Port	Data & Control
	Description	Active Only	Active Only	Ports Both
				Active
+IFC	Local Flow Control	DATA	NA	DATA
	Settings
+IPR	Rm Interface Baud	DATA	NA	DATA
	Rate Setting
+CRM	Rm Interface	DATA	NA	DATA
	Protocol Setting
+CTA	Dormant Mode	DATA	NA	DATA
	Timeout Setting

Port Activation (DTR) Changes during Operation

When DTR changes on the Data or Control ports, the following operational changes occur:

•Any AT command being processed on the Control or Data ports is terminated and the port that processes AT commands, based upon the arbitration rules (see Port Arbitration Behavior on page 5-9), is placed in a state to begin processing of a new AT command.

•If a call (data or special test call—Markov or Loopback) is in progress, changes in DTR on the Control port will not terminate the call.

•If a call (data or special test call) is in progress, changes in DTR on the Data port will terminate the call if the port is configured to do so with AT&D2. Additionally, if none of the DTR lines are asserted, the module will power down terminating the call regardless of the AT&D setting (See Power-Onand Power-Offon page 7-18).

AT command configuration parameters maintained by the AT command processor are not modified or reset to their default values when a port configuration change occurs due to a DTR change. The current state of these parameters is associated with the newly activated port after the change occurs, as defined in Table 5-4.

80-99208-1 Rev. D 5-15