Psion Teklogix 7527S User's Guide download pdf (Page 207)

Chapter 22: Wireless Wide-Area Networking

Virtual Serial Port

Psion Teklogix Mobile Devices SDK Developers Guide 195

22.3.2.3 AT Commands

The virtual serial port can be used by an application to send AT commands to the modems. Since

AT command sets differ between modems a detailed knowledge of the modem in question is re-

quired. Therefore, this use of the virtual port should be limited to legacy applications. New

applications should use the Psion Teklogix Mobile Devices SDK to access the network status,

SMS functions, etc.

The Option Globetrotter (v1, v2, Combo) and Sierra AC775 do not forward unsolicited AT

command responses (e.g. "+CREG:" responses that were enabled with "AT+CREG=1") to the

virtual port. For the Enfora ADT0110 and GSM0110, Siemens MC75, Option Globetrotter (v1,

v2, Combo), as well as Sierra AC775 it is possible to send AT commands to the modem while a

packet data connection through the WWAN driver is active; however, for the Option Globetrotter

(v1, v2, Combo) a transition of the emulated DTR signal on the virtual port closes that packet data

connection.

When porting legacy applications the virtual serial port together with WWAND/jointfilesconvert/393180/bg utility can be

used to analyze the AT commands sent by that application. With the debug level set to 6 all AT

commands are shown in the log.

22.3.2.4 Entering AT Commands in Windows CE

To enter modem AT commands on a Windows CE device, you first need to create and open a

console window, as described in the following steps:

1. Go to Start > Settings > Network...

2. Double-click on the Make New Connection icon.

3. Enter a name for the new console connection in the text box.

4. Click the Next button (leave the connection type as Dial-Up Connection.

5. In the Select a modem drop-down box, select Virtual WWAN port.

6. Click the Configure button.

7. Set Flow Control to None, and leave the other Connection Preference settings at their

default values.

8. Check the Use terminal window before dialing checkbox.

9. Click OK to close the Device Properties window.

10. Click the Next button.

11. Enter an arbitrary value (e.g. 1) for the Phone number text box.

12. Click the Finish button to complete the connection configuration.

13. Back on the Network... screen, double-click the icon for your newly created connection.

14. Click the Connect button. The terminal window will open after a few seconds.

15. Type the AT command ATE1 followed by ENTER to enable command echo, which will

allow you to see the subsequent commands you type.

The terminal window is now connected to the modem, allowing you to enter AT commands.

When you are finished entering commands, close the terminal window.

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Psion Teklogix 7527S User's Guide Page 207