Appendixes – Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) User Manual

Page 779

APPENDIXES

Technical

Appendixes

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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).

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

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.