Insys GSM Small 11-02-01-03-02.001 Manuale Utente

4. Installation and Initial Operation 

 

17 

•  INSYS GSM small and the terminal device (configuration PC or control) have to 

operate the serial interface with the same baud rate and the same data format, 
unless auto baud is not used. The used COM port may not be used by another 
application. 

No connection 
•  Is the signal quality of the GSM network sufficient? See next page. 
•  Has the INSYS GSM small been registered? See next page. 
•  Has the SIM card been enabled for data connections: See Chap. 3.2.5. 
•  Was the phone number for data connection dialed? See Chap. 3.2.5. 
•  Is the power supply during sending sufficient? See Chap. 3.2.3. 

•  Has the number for the SMS service center been entered correctly? See Chap. 5. 
•  Deactivate the reaction to DTR drop, if the device is connected via a serial 

interface which does not support a DTR function. 

•  Deactivate handshake, when the device is connected via a serial interface 

which does not support hardware handshake (protocol). 
 

 
The query of the signal quality at the reception location takes place using the 
AT command: AT+CSQ?<CR> 
Response: 
+CSQ: x,y 
 
x

:   signal quality at the reception location. 

 

Value range from 0 … 31 

 

31...23: 

very good quality 

 22...11:  normal 

10...0: 

 bad; these values should be avoided after installation or 
mounting of the antenna at the operation location, in order 
to make sufficient reserves available for the application of the 
devices. 

y

: Bit 

error 

rate 

Values from 0 … 7 possible. 
Only current when registered. 

Version  1.00 / 09.04