CM2904 Instruction Book © 2009 - 2022 Parker-Hannifin Corporation Page 50 of 51
Glossary of Terms
Glossary of terms
12. Glossary of Terms
12.1. Glossary of terms
Table 24: Terms / Abbreviations used in this document.
Abbreviation
Description
CAN
Controller Area Network. 2-wire differential communication
bus.
FMI
Fault Mode Identifier. Identifies fault mode in J1939 standard.
J1939
SAE J1939. Standard used for communication and diagnostics
among vehicle components.
MCU
Microcontroller Unit. Core which runs the application.
PGN
Parameter group number. Identifies parameter group in J1939
standard.
PWM
Pulse Width Modulation. Way of providing intermediate
amounts of electrical power between fully on and fully off
RAM
Random Access Memory. Volatile memory.
ROM
Read-Only Memory. Non-volatile memory.
SPN
Suspect Parameter Number. Identifies parameter in J1939
standard.
ADC
Analog to Digital Conversion (Abbreviation means also
“Analog to Digital Converter”)
FLASH
Non Volatile memory for general storage & transfer of data.
Flash memory is one type of “Read Only Memory” that can be
re-programmed.
FET
Field Effect Transistor - an electronic device used either as a
power switch, or amplifier in electronic circuitry. FETs are
typically used as drivers.
MDIN
Multistage Digital Input. Analogue inputs that are used in
manner of digital inputs. With MDIN inputs it is possible to
assign more than 2 stages for the input.
AIN
Analogue Input - an input that allows a voltage level to be read
and converted to discrete digital values within a
microprocessor.
DIN
Digital Input - an input that is typically controlled by an
external switch that makes the input either active “ON” or
inactive “OFF”
