> For the complete documentation index, see [llms.txt](https://navixy.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://navixy.com/docs/qna/device-related-questions/coban-devices-sms-and-gprs-differences.md).

# Coban Devices SMS and GPRS differences

## Question:

Why the Coban output works by SMS but not when sent from the server?

## Answer:

The Coban 403 uses two different command formats depending on the channel:

| Channel                | Command to activate (immobilize / output ON) | Command to deactivate (resume / output OFF) |
| ---------------------- | -------------------------------------------- | ------------------------------------------- |
| SMS                    | `stop123456` *(password may differ)*         | `resume123456`                              |
| GPRS (server → device) | `**,imei:<IMEI>,109`                         | `**,imei:<IMEI>,110`                        |

`stop123456` is an SMS-only command (user manual, Remote immobilizing). Over GPRS, the device expects the protocol keyword `109` / `110`, not the SMS text.

So if the server sends `stop123456` (or the same SMS string) over GPRS, the device will not execute it. That is expected behavior, not a wiring or output failure—SMS working already shows the relay/output is fine.

What to do instead

1. From the platform/server, send the GPRS frame: `**,imei:<IMEI>,109` (and `110` to turn it off).
2. Or keep using SMS: `stop` / `resume` + device password.

Also check if GPRS still fails after using 109

* Device must be online in GPRS mode when the command is sent.
* With default delay mode, cut-off may wait until speed is < 20 km/h (device may reply `509`).
* Confirm the server is really sending `109`/`110`, not the SMS string.

## Links

[Output Control](https://navixy.com/docs/expert-center/faq-and-troubleshooting/gps-devices/outputs-control)

[Output Commands](https://navixy.com/docs/user/guide/devices-and-settings/object-management/commands)

[Coban Models](https://navixy.com/hu/devices/coban/)


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