Device status ready
From HackTheIBus
[edit]
Description
The Device Status Ready message is a responce to the Device status request message. Device Status Ready is sent to show that a device is present, alive, and responding.
A typical usage of this message is for the CD changer to respond to the radio, so that the radio knows the CD changer is fitted. Only when the CD changer responds, does the radio enable the CD changer options on the user menu.
This message has medium priority. (Priority 2, >2.3ms pause after request)
[edit]
Format
| Message code | 0x12 |
|---|---|
| Message length | 6 bytes |
| Data size | 1 byte |
| Frequency | On request |
| DB1 |
|---|
| Status |
Status = bit mapped, reason for readiness.
- Bit 0 = After reset
- Bit 2...7 = not used / unknown
[edit]
Example
18 04 68 02 00 76
"CDC --> RAD : Device status ready"
| Meaning | CDC | len | RAD | type | DB1 | CS |
|---|---|---|---|---|---|---|
| Value | 18 | 04 | 68 | 02 | 00 | 76 |
