DO (Device Options)
This command applies to the XBee Cellular Modem.
Enables and disables special features on the XBee Cellular Modem.
2G fallback
The XBee Cellular Modem device is capable of supporting 2G (GSM/GPRS) fallback when a 3G network is not available. However, connecting to a 2G network draws bursts of current from the power supply in excess of 2.5 A. This may cause host equipment, including the standard XBee development board, to brown out. Therefore, if you enable 2G fallback mode you must observe the special considerations given in Power supply considerations.
After changing this setting, you must:
- Use WR (Write) to write all values to flash.
- Use SD (Shutdown) to safely power down the cellular modem.
- Use FR (Force Reset) to reset the device.
- Wait for the cellular component to be initialized: AI (Association Indication) reaches 0x00.
The following table provides the 2G power consumption at 3.8 V and room temperature.
| 2G Fallback mode (3.8 V) | Average current | Peak current |
|---|---|---|
| GSM connected mode, max TX power (1 TX, 1 RX slot) | 220 mA | 2.6 A |
| GPRS connected mode, max TX power (4 TX, 1 RX slot) | 700 mA | 2.6 A |
| EDGE connected mode, max TX power (4 TX, 1 RX slot) | 280 mA | 2.6 A |
| 2G active mode | 80 mA |
Bitfield
| DO value | Remote Manager | 2G fallback | AT&T Configuration |
|---|---|---|---|
| 0x00 | Disabled | Disabled | Enabled |
| 0x01 (default) | Enabled | Disabled | Enabled |
| 0x02 | Disabled | Enabled | Enabled |
| 0x03 | Enabled | Enabled | Enabled |
| 0x40 | Disabled | Disabled | Disabled |
| 0x41 | Enabled | Disabled | Disabled |
| 0x42 | Disabled | Enabled | Disabled |
| 0x43 | Enabled | Enabled | Disabled |
| Bit | Description |
|---|---|
| 0 |
Enable Remote Manager support Controls whether Remote Manager is enabled. Digi recommends that Remote Manager remains enabled. |
| 1 |
Enable 2G fallback See 2G fallback. |
| 2-5 | Reserved for future use |
| 6 |
Disable AT&T configuration Set bit 6 to disable cellular configuration specific to AT&T in the United States. This should only be enabled if you are operating the device in Europe and the device takes a long time to reach AI = 0x00 or never reaches AI = 0x00. Support for disabling AT&T configuration was added in firmware version 11315. |
| 7 | Reserved for future use |
Default
1 (Bit 0 enabled)
PDF
