Brother QL-720NW - Manual (Page 41)

Raster Command Reference
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5. Flow Charts
5.5 Flow for setting serial connection baud rate
Computer (host)
Specify baud rate
“Specify baud rate completed” status (normal status)
Old baud rate
New baud rate
Printer waiting to
recover from 3000 ms
Sleep
Status information request
* The request/response at the new baud rate are
simply to verify that communication is possible and
may be omitted.
Printer
Status (response to status information request)