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level input is active when shorted to ground, and is used to control any combination
of the following features: one-step retard, spark energy level or multi-strike option.
These features are enabled based on the special features configuration settings as
described in the programming instructions, form CPU-95EVS PI.
3.0 DISPLAY MODULE USER INTERFACE AND INPUTS
3.1 Display Module: serves as the user interface for the CPU-95EVS ignition system.
An RS-485 two wire serial communications format is used to connect the Display
Module to the Ignition Module. This link communicates between the modules
using a proprietary protocol.
3.2 LCD DISPLAY: A graphical, back-lit LCD display is used to provide output to the
user. A sealed membrane keypad is used to accept user input. The LCD display
and the keypad function together to provide an interactive user interface which
prompts the user as different functions are selected.
3.3 All actions and adjustments are immediate and are performed on an incremental
basis using up and down arrow keys. All keypad adjustments, except individual
offset timing adjustments are performed directly in non-volatile EEPROM
memory. This EEPROM memory retains previous settings even after an engine
shutdown or an ignition power down.
3.4 Capital letters are used on the LCD display screen to designate an active
selection while lower case letters are used to indicate other possible options.
3.5 The display module includes an isolated current loop input which can be
configured to control spark timing. Reference the programming instructions, form
CPU-95EVS PI.
3.6 One logic level digital input (MISC. INPUT) is available at the Display Module
which can be used in the same fashion as the input of the Ignition Module. If
either input is shorted to ground, then the MISC. INPUT functions are active.
3.7 The display module incorporates a half duplex RS-485 port which is Modbus RTU
slave compliant. The protocol used follows the Modicon Modbus RTU standard. For
a complete list of the Modbus register addresses, SEE SECTION 15.0. The CPU-
95EVS terminal program CD contains a PC-based Modbus compatible monitoring
program which can be used to access the ignition data remotely.
3.8 One USB peripheral port. The USB port can be configured to allow programming
of the attached ignition module when used with CPU-95EVS Terminal program
V1.0 and above. The USB port can also be configured as another Modbus RTU
interface.
CPU-95EVS OI 7-13
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