Synaccess Networks NP-0801DTM - Manual (Page 19)

INTRODUCTION
19 HSPA+ AT Commands Reference Guide
Numeric form Verbose form
11 CONNECT 4800.
12 CONNECT 9600.
15 CONNECT 14400.
23 CONNECT 1200/75.
Command Response Time‐Out
If response codes are enabled, which is the default setting, then every command issued to the module returns a
result response.
The time needed to process the given command and return the response varies, depending on the command type.
Commands that do not interact with the SIM or the network, and only involve internal setups or readings, have an
immediate response.
Commands that interact with the SIM or the network can take many seconds to send a response, depending on:
„
SIM configuration—for example, number of contacts stored in the phonebook, number of stored SMS.
„
The network the command may interact with.
Command Issuing Timing
The chain Command ‐> Response is always respected. You may not issue a new command until the module
finishes sending all of its response result codes.
This applies especially to applications that “sense” the OK text and therefore may send the next command before
the complete code OK is sent by the module.
It is recommended to wait for at least 20ms between the end of the reception of the response and the issue of the
next AT command.
If the response codes are disabled, and as such, the module does not report responses to the command, then the
20ms pause time is respected.
During command mode, due to hardware limitations, under severe CPU load the serial port can lose some
characters if placed in autobauding at high speeds. Therefore if you encounter this problem fix the baud rate with
+IPR command. The flow control in command mode is enabled.