© 2009 Cypress Solutions
Complete Manual: CTM-15X Firmware 1.2.0
(Revision 1.0)
17
2BOperating Your Modem
For analog voltage monitoring the measurement range is 0 to +10 volts with 10mV resolution. The input
can withstand up to 36 volts. Note that the IN GND connection is referenced to the modem’s supply
ground.
3
Operating Your Modem
3.1
Automatic Power Control
The supply voltage must be a minimum of 9VDC for the CTM-15x to operate. With the power applied it
will power-up in its operating mode.
Note: In some vehicle operation, when starting the engine the vehicle supply voltage will dip below 9VDC
momentarily. This will cause the modem to reset as the power dips below 9VDC. If continual operation is
required, contact Cypress Solutions for an accessory power regulator that plugs in-line with the modem
power supply. This power regulator will prevent unnecessary resets.