# SYNC\_CHANNEL\_NUMBER

### ID: 169

Used to query a previously assigned channel number. Send this packet ID to a device with no payload (or send this packet ID in a GENERAL\_REQUEST packet), and device responds with this packet ID and the payload defined below. See [SET\_SYNC\_CHANNEL\_NUMBER](https://docs.ceruleansonar.com/c/cerulean-ping-protocol/general-packet-definitions/set_sync_channel_number) for full description of use and purpose.

<table><thead><tr><th width="191">Data Type</th><th width="219">Name</th><th>Description</th></tr></thead><tbody><tr><td>u8</td><td>channel number</td><td>channel number previously assigned to this device. Will be 255 if no channel previously assigned.</td></tr><tr><td>u8</td><td>number of channels</td><td>number of channels in the sync group</td></tr></tbody></table>