Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 761)

APPENDIXES
Technical Appendixes
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WM_DEV_OAT_UGD_049 - 001 APPENDIXES August 23, 2007
When wanting to send the DTR MSC protocol frame, the DTE MUST first sends
F9F9F9 wake up frames, waiting for Wireless CPU ® response, and then sends as a
valid frame the DTR on MSC frame.
Otherwise, the Wireless CPU ® might sleep on again if all DTR are detected low !
TX data line (DTE)
1
2
3
4
RX data line (DTE)
No data
Valid protocol
frame
F9F9F9F9 wake up
frame (order target to
wake up)
F9F9F9F9 wake up frame acknowledgement (inform
Application that target is waken up)
1:: DTE sends 27.010 protocol F9F9F9F9 frame to wake up the asleep target.
2:: DCE replies with 27.010 F9F9F9F9 wake up frame as acknowledgment and waits
for a valid frame.
: DTE sends a valid 27.010 frame in order to have the target stop its
acknowledgment.
(It is required that the first valid frame is a MSC frame that raise application
DTR)
: DCE stops sending F9F9F9F9 answer after receiving this valid frame.
F9F9F9 protocol wake up frame
F9F9F9 wake up response
DTR on MSC frame
MSC response
Application raises one of the DTR
(or reopen a COM port to make it raised)
Target stops
sending F9F9
flags when
receiving a valid
frame
Target PC MUX driver PC Application
Note: If the valid frame is a DATA frame, the Wireless CPU ® does not detect any DTR
change and sleeps on again with the PSC frame.