> 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/)


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation by asking a question.

Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:

```
GET https://navixy.com/docs/qna/device-related-questions/coban-devices-sms-and-gprs-differences.md?ask=<question>&goal=<user_goal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.