User's Manual

Page 29 of 187
TECHNICAL MANUAL
Telit GM862 PCS
Tri Band GPRS Data Terminal System Rev.1
2.2.2 Information responses and result codes
The TA response, in case of verbose response format enabled, for the previous examples command
line could be as shown below:
information response to +CMD1? <CR><LF>+CMD1:2,1,10<CR><LF>
information response to +CMD1=? <CR><LF>+CMD1(0-2),(0,1),(0-15)<CR><LF>
final result code <CR><LF>OK<CR><LF>
Moreover there are other two types of result codes:
• result codes that inform about progress of TA operation (e.g. connection establishment
CONNECT)
• result codes that indicate occurrence of an event not directly associated with issuance of a
command from TE (e.g. ring indication RING).
Here the basic result codes according to ITU-T V25Ter recommendation
Result Codes
Numeric form Verbose form
0 OK
1 CONNECT
2 RING
3 NO CARRIER
4 ERROR
6 NO DIALTONE
7 BUSY
8 NO ANSWER
2.2.3 Command Response Timeout
Every command issued to the Telit GM862-PCS module returns a result response if response codes
are enabled (default). The time needed to process the given command and return the response varies
from command to command and may depend also from the network on which the command may
interact. As a result every command is provided with a proper timeout time, if this time elapses
without any result from the operation, then an ERROR response can be reported as if the operation
was not successful and the operation is anyway terminated.
The timeout time is quite short for commands that imply only internal set up commands, but may be
very long for command that interact with the network (or even a set of Networks).
The default timeout is 100 ms for all the commands that have no interaction with the network or
upper software layers.