Device status request
From HackTheIBus
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Description
The Device Status Request message is sent from one device to another to determine if the device is present, alive, and responding.
It is often polled every 30 seconds.
The polled device will respond normally with a Device status ready message. If a device fails to respond then it is assumed the device is not fitted to the vehicle, or is faulty.
A typical usage of this message is for the radio to poll the CD changer to see if it is fitted. Only when the CD changer responds, does the radio enable the CD changer options on the user menu.
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Format
| Message code | 0x11 |
|---|---|
| Message length | 5 bytes |
| Data size | 0 bytes |
| Frequency | every 30 sec. Can vary |
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Example
68 03 18 01 72
"RAD --> CDC : Device status request"
| Meaning | RAD | len | CDC | type | CS |
|---|---|---|---|---|---|
| Value | 68 | 03 | 18 | 01 | 72 |
