Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 778)

APPENDIXES
Technical Appendixes
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WM_DEV_OAT_UGD_049 - 001 APPENDIXES August 23, 2007
8 : V24 triggers the DTE CTS signal to allow AT commands again. (CTS is high)
3.7.4.2.2 On DCE initiative: Wake up by AT unsolicited indications ( e.g. "RING " indicator)
CTS (DTE)
RX data line (DTE) "RING" "RING"
Not Clear to Send
Busy DTR (DTE)
1 1 2 2
1: An incoming call occurs. Consequently unsolicited indications ("RING") are sent to
the DTE.
8 : As soon as unsolicited indication has been sent, the port switches back to
sleep mode state (as long as there is no more AT command response to send
and that DTR remains High)
3.7.4.3 Complete Sequence Behavior
DTR (DTE)
CTS (DTE)
TX data line (DTE)
RX data line (DTE)
Not Clear to Send
Clear to Send Clear to Send
Ready
Ready
Busy
"RING" "RING"
time
time
time
time
"ATA"
"OK"
1
2 3
4 4
5 6
7
8
1: The application (DTE) drops its DTR to indicate to DCE a busy state
2: Wavecom Wireless CPU ® (DCE) computes and check if there are still AT
responses to send on that port.