Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 777)

APPENDIXES
Technical Appendixes
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WM_DEV_OAT_UGD_049 - 001 APPENDIXES August 23, 2007
3.7.4.1 Sleep on Procedure
In order to place a serial port in Sleep Mode state, the DTE just has to drop its DTR
signal to indicate that it is Busy. Then, Wavecom Wireless CPU ® (DCE) sets the DTE
CTS low.
1
3
2
DTR (DTE)
Clear to Send
Busy
RX data line (DTE)
Clear to Send
CTS (DTE)
Ready
1: The application drops its DTR to indicate a busy state
2: Wavecom Wireless CPU ® (DCE) detects DTR drop and check if there are still AT
responses to send on that port.
8 : When DTR is low and there are no more AT response, the DCE sets the
application (DTE) CTS low. (At this point, the associated serial port is in Sleep
Mode state)
Note: While in data mode, the CTS does not follow the DTR.
3.7.4.2 Wake up Procedures
3.7.4.2.1 On DTE initiative: Wake up by DTR Raise
DTR (DTE)
Busy
CTS (DTE)
Not Clear to Send
Clear to Send
Ready
1
2 3
1: The application raises its DTR signal to indicate a ready state (meaning DTE wants
to communicate with the DCE).
2: Wavecom Wireless CPU ® (DCE) takes into account the DTR signal change. (MSR
IRQ for physical port or protocol frame for CMUX)