CORE AS (EVAPORATOR) 5I3555 - Caterpillar

PWM Sensor
This function is used to measure the frequency and duty cycle of a pulse width modulated (PWM) signal.This capability can be used to verify or diagnose the operation of some of Caterpillar's sensors and actuators. See the troubleshooting guide for the equipment you are using to determine when to use this function. This function is capable of displaying frequencies from 1 Hz to 1100 Hz with duty cycles ranging from 4 to 96 percent.Acceptable input signal levels to the 8C9800 PWM Signal Adapter range from 4 to 15 Volts peak positive voltage.The LCD will display the values of frequency and duty cycle unless the values are out of range. Signals with pulse widths that are too wide will cause a message on the LCD and values to be shown as ------- Signals with pulse widths that are too narrow will cause a message on the LCD and values to be shown as +++++++. The Duty Cycle of the signal is represented as a number of percent of time that the signal is at a high (+4 to +15 volts) level versus the time that the signal is at a low (0 volts) level.The Frequency of a signal is found by determining the period of time that the signal takes to go through one cycle of low to high and back to low again.The number of times a signal's period can occur in one second is its frequency.SPM Version Numbers
This function is used to display the version numbers of the service program modules installed in the 8T8697 ECAP that you are using.The function searches through the installed modules and displays their names and version numbers in a list.The LCD can display six lines from the list at one time.If the list is longer than six lines, use the UP arrow and DOWN arrow keys to move up and down through the list.Each time one of the arrow keys is pressed, the list position is shifted one line.Metric or English Display Units
This function is used to select between Metric and English display units. Example: Change from METRIC to ENGLISH display units.* Select item 4 by pressing the DOWN arrow key three times or entering 4.The block cursor will move to item 4.* Confirm your selection by pressing RETURN.Item 4 in the menu list will be changed with the words METRIC and ENGLISH switched.Port 1 RS-485 Connector Pin Definitions
1 + Battery (7 to 40 Vdc)2 -Battery (Ground)3 -Battery (Ground)4 Data Link Minus5 No Connection6 RS-232C Receive Data7 Data Link Plus8 RS-232C Transmit9 Software controlled, open collector output (sink 5ma @ 5Vdc)Port 2 RS-232C Connector Pin Definitions
Service Program Module Installation
Service programs for use with the ECAP are provided through Caterpillar Dealers.The ECAP will be delivered with utility programs for selecting Metric or English display units and routines for basic communications abilities.When you receive a specific service program you will need to install it in the ECAP before it can be used.When service program updates occur, you will be able to install