Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 779)

APPENDIXES
Technical Appendixes
© Restricted
Page: 73 / 80
This document is the sole and exclusive property of Wavecom. Not to be distributed or divulged without
prior written agreement.
WM_DEV_OAT_UGD_049 - 001 APPENDIXES August 23, 2007
3: Since no more AT response is to be sent, the DCE sets CTS to low so that
application (DTE) can not send any data to the Wavecom Wireless CPU ® (DCE).
Ù At this stage, the associated serial port is in Sleep Mode state.
4: An incoming call occurs. As a consequence, unsolicited AT indications (e.g.
"RING") are sent to the DTE.
Note that even if RING are sent, Serial Port remains in Sleep Mode state.
5: Customer application (DTE) wants to answer to "RING" unsolicited AT
indications. It MUST raise first DTR to wake up the serial Port.
6: On Wavecom Wireless CPU ® (DCE), detection of DTR rise informs that
customer application (DTE) wants to get out from sleep mode state. DCE sets
CTS high so that customer application (DTE) can send again data to Wavecom
Wireless CPU ® .
Note that at this stage, Serial Port is no more in Sleep Mode state.
7: Customer application (DTE) replies to RING indication with "ATA" command.
8: Wavecom Wireless CPU ® (DCE) acknowledges and processes the command.
Note that this behavior applies whether W32K is activated or not.
3.7.4.4 Transition State (from Asleep to Awake)
When unsolicited AT responses are to be sent (e.g. "RING" indication), V24 software
elements enters a transition state that places the global sleep mode state in the
"Awake State". Thus, until unsolicited responses are sent, the Wavecom Wireless
CPU ® can not enter Low power mode consumption (W32K). As a consequence, RTS
signal MUST remain High to allow the transmission of the unsolicited response.
Note: mind that unsolicited responses are broadcasted on all available serial ports Ù
when unsolicited responses are to be sent (e.g. "RING") on a serial port and signals
are not managed (e.g. RS232 cable is disconnected whereas associated V24 serial
port is still registered) then Wavecom Wireless CPU ® is not allowed to enter W32K
low power mode consumption.
3.7.5 Case of Several Serial Ports Use
The behavior specified in §3.7.4 applies to each of the activated serial ports (physical
or virtual e.g. CMUX).
Note: When Wavecom 32K low power mode is activated (AT+W32K=1), Wireless
CPU
® really enters low power mode when all activated serial ports are set to sleep
mode state.
3.7.6 UART2 Exception (on all Wireless CPU ® s)
Physical block of the UART2 only provides Wireless CPU ® with RX/TX and CTS/RTS
signals so that DTR can not be wired on UART2 serial port.
Since only RXD/TXD and RTS/CTS are available, there is no way to enter/leave sleep
mode on this particular port.