Cypress CTM-130 manual Modem Operation, Automatic Power Control

9 Modem Operation

9.1 Automatic Power Control

The supply voltage must be at least 9VDC for the modem to operate. With the power applied the modem will power-up in its operating mode and will then follow the settings applied for power management.

The CTM-130/132 Chameleon modem has three power modes that can be set with the ability to have an external event change this mode (refer to the modem’s AT Command reference manual for details).

Mode	Description	Mode change event
Operation	In this mode the modem is fully	The modem can be configured to go
	powered up and ready to receive or	back into either standby or shutdown
	make network connections	mode after a defined period.
Standby	Only the CDMA module and modem’s	An incoming circuit switched call can be
	power management circuits are	used to wake the modem up and put it
	operating.	in full operation mode.
		An input event can be used to wake the
		modem up and put it in full operation
		mode.
		A timer can be set to wake the modem
		after a fixed period.
Shutdown	Only the modem’s power management	An input event can be used to wake the
	circuits are operating.	modem up and put it in full operation
		mode.
		A timer can be set to wake the modem
		after a fixed period.

The CTM-130/132 also has the ability to be automatically put into shutdown mode depending on the state of the power standby signal (the white power wire), and the RS232 port. A programmable timer can also be configured (refer to the modem’s AT Command reference manual for details).

.

The default setting (modem firmware release 1.2.1) is for the modem to go into shutdown immediately upon detecting that the power standby signal is off. It will then power back up into full operation mode when the power standby signal is switched back on.

Other possible configurations include:

Ignore both the power standby and RS232 port status and remain in full operation mode.

Go into shutdown only after both the power standby and RS232 port have been switched off, and after a delay of 1 hour – this may be useful to allow the modem to keep reporting its position for one hour after the vehicle has been shutdown. Power back on into full operation mode when both the power standby signal and the RS232 port are switched on again (note – no delay when returning to operation mode).

© 2007 Cypress Solutions Installation and Operation Manual: CTM-130 / CTM-132 (Revision 1.2) Page - 27 -