UMAX030440 Version 2B 4-51
GENERAL INFORMATION
1.1. Introduction to AX030440 Features
The 4UIN-8VREF-2CAN electronic control unit (ECU) is designed to provide a simple interface for
Universal Inputs over a J1939 CAN Network, to be used in a power generator set or industrial
environment. The hardware supports 4 Universal Inputs. The universal inputs accept voltage,
current, resistance, frequency, PWM duty cycle, and discrete voltage levels. A +8V or +5V
reference voltage output can be used to power external sensors/equipment. The voltage reference
level can be configured using EA.
The ECU has been designed to allow the maximum amount of versatility to optimize the
performance of the machine. Numerous configurable variables, called setpoints, have been
provided which are accessible using Axiomatic Technologies’ Electronic Assistant. Information
about the setpoint defaults and ranges is outlined in Section 3. The EA communicates with the
controller over J1939 CAN bus and uses Memory Access Protocol (MAP) to read/write each
setpoint. Once the ECU has been setup as desired, the setpoints can be saved to a file, and
flashed into other controllers using EA.
The ECU is an arbitrary address capable ECU, which can perform dynamic address allocation at
the run time. It also provides all necessary network support required by the J1939 standard.
1.2. J1939 Network
– Diagnostic Broadcast
Diagnostic messages are triggered by the internal function blocks and then broadcasted on the
CAN bus network. However, in some applications this broadcast may not be required and so the
