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the radio application should notify the modem to stop transferring data (deassert
DTR, or switching the modem to transparent mode). If the application receives a
PWR_SUSPENDREQUEST
reject the request in order to prevent data loss. When Resume occurs, it should
notify the modem to continue (assert DTR, or switch the modem to Native mode).
The MW-520 resumes from Suspend mode when an RI signal is received from an
external radio-modem connected to COM1, or from the internal radio-modem
connected to COM3 (resume occurs on the RI falling edge). The modem sends an
RI signal only when the DTR line is deasserted.
.
Ensure that your application is power management aware and
compatible with Microsoft Power Management API.
Note
The RF-modem power-on can be controlled automatically via Windows start-up
by an MW-520 HWAPP application (the power-on option is the default option).
Any Modem that Supports DTR Functionality
When the MW-520 enters Suspend state, the DTR is inactivated.
When the MW-520 is resumed from the Suspend state, an application should
activate the DTR when it is ready to receive incoming data from the RF-modem.
The required sequence when resuming from Suspend:
1. Get the Windows message
2. Assert DTR.
3. Return with
PWR_OK
message during data transferring, it is recommended to
PWR_SUSPENDRESSUME
from the window procedure.
Main Peripherals
.
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