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2.0 DISPLAY MODULE
2.1 The Display Module serves as the user interface for the DE-2500 system. It is in a 6.5" x 6.5"
panel mounted enclosure and consists of an alphanumeric 20-character x 4-line backlit LCD
display, a 16-key front-mounted keypad, DB-25 D-Sub and DB-9 D-Sub connectors and three
pairs of serial port indicators.
2.2 The keypad is a sealed membrane unit that contains the familiar STOP, RESET and TEST
keys as well as other keys used to navigate through channel status and description, view
process screens, and to edit the configuration.
2.3 The LCD displays a “home screen” that displays a status line, the speed, the suction pressure
and the discharge pressure. A “view screen”, which is available by pressing the VIEW key,
displays up to eight user configurable analog process labels, values and bargraphs of the
corresponding analog inputs. Pressing the VIEW CHANNEL key displays the channel
number, its timer status, analog value (if applicable) and the corresponding 20-character user
defined label.
2.4 The keypad, along with the LCD display, are used to navigate through channel status and
descriptions, view process screens, and to view or edit the system’s configuration. The
8UNITS or 9UNITS or the 6TENS or 7TENS keys are used to access channels by increasing
or decreasing the channel numbers by one or by ten with each key press. Pressing the NEXT
key advances the display to the next screen or item. All menu adjustments are saved in non-
volatile EEPROM memory by pressing the ENTER key. The EEPROM memory retains the
current configuration during normal operation, after compressor shutdown and a system
power-down.
2.5 Three pairs of LED’s are provided on the back of the Display Module for troubleshooting
purposes, one Receive (RX) and one Transmit (TX) LED for each port. The TX LED will flash
when the Display Module is transmitting serial communications on the labeled port. The RX
LED will flash when the Display Module is receiving serial communications on the labeled port.
3.0 POWER SUPPLY MODULE
3.1 The Power Supply Module is made to be rail mounted and is the interface between the
Terminal and Display Modules and to other systems. It typically plugs directly into the
Terminal Module using the DB-25 connectors and is held together with screws and screw
locks.
3.2 The Power Supply Module is made to accept up to four industry standard, commercially
available 0.6 inch plug-in Output Modules. The Output Modules provide a means of using the
DE-2500 controller safety shutdown system status to interface with other systems on the
engine/motor and compressor. A typical application would be as a relay or solenoid coil
driver. The Output Modules are optically isolated, solid-state switches which are isolated from
power supply minus and engine ground. The Output Modules will be in the open (de-
energized) condition when the unit is unpowered.
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