User Guide

CTM-110/120 Installation & Operation Manual

Page 16

1702-0037 Rev 3.2

8.1 Automatic power control

The CTM-110 Chameleon modem has a low power mode that shuts down all

unnecessary circuits when the modem is not in use but will automatically power up when

it detects user action.

The supply voltage must be at least 8VDC for the CTM-110 to operate. Below this level

the modem will enter low power standby mode.

Operation mode is entered when the modem detects that the RS232 port is active (DTR

going active is used for this)

AND

the standby signal is greater than 9VDC.

With these two conditions met the CTM-110 modem will enter operating mode in 10

seconds. In operating mode the power LED will be on solid.

Standby mode is entered when the modem detects that the RS232 port is inactive (DTR

going inactive is used for this)

AND

the standby signal is less than 9VDC (connected to 0V or disconnected).

With these two conditions met the CTM-110 modem will enter standby mode in 5

seconds. In standby mode the power LED will flash slowly.

8.2 Manual power control

The CTM110 modem can be manually put into low power standby mode at any time by

pressing and holding for at least one second the standby button which is located inside the

front panel (use a straightened paper clip to access it through the hole).

Pressing and holding the standby button when the CTM-110 modem is in low power

standby mode will put it into operating mode – but note that if either the RS232 port is

inactive OR the standby signal is less than 9VDC, then the CTM-110 will automatically

enter low power standby mode again after 5 seconds!

Operation