Murphy Display
and Diagnostic Module
MDDM-00071B
Revised 04-02
Catalog Section 78
(00-02-0429)
MDDM Series
Shutdown
(LED) Red
Alarm (LED)
Amber
■
Specifically Designed For SAE J1939 Controller
Area Network (CAN) Equipment Applications
■
Displays Over 30 Standard SAE J1939
Parameters Broadcast by Major Engine and
Transmission Manufacturers’ ECM’s
■
■
Displays Active Faults and ECM Stored Fault
Codes For Diagnosing Equipment Malfunctions
TM
Scroll Up
Scroll Down
Re-broadcasts Critical Data to MLink
Analog Gages
MDDM. The MDDM and all connected compo-
nents can be powered by 12 or 24 volt systems,
are back lit using LEDs, and are 100% environ-
mentally sealed.
Description
Specifications
The Murphy Display and Diagnostic Module
(MDDM) is the keystone in a line of components
manufactured by FWMurphy as part of its J1939
MurphyLinkTM System. The J1939 MurphyLinkTM
System has been developed to meet the needs for
instrumentation and control on electronically
controlled engines communicating using the
SAE J1939 Controller Area Network (CAN).
Bezel: Stainless Steel (Black Optional).
Membrane Switch: Polyester.
Case/Clamp: Nickel Plated Steel,
Aluminum Killed, QQ-S-698.
Engine Parameters
The following are some of the engine para-
meters displayed by the MDDM in English
or Metric units (when applicable):
Maximum Panel Thickness:
0.30 inch. (8 mm).
Mounting Hole:
2.062 inch (52 mm) in diameter.
Dial: White on Black.
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The MDDM is a powerful, easy to use multi-
function tool that enables the operator to view
many different engine parameters and engine
service codes.
The MDDM includes a two line by eight charac-
ter backlit LCD display. The top line displays
data labels, i.e. "EngHrs". The bottom line dis-
plays appropriate units information i.e "80 psi"
for oil pressure.
Engine Hours
Reversed Polarity:
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Engine RPM
Withstands reversed battery terminal
polarity indefinitely within operating
temperatures.
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System Voltage
●
% Engine Load at the current RPM
CAN BUS: SAE J1939 Compliant.
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Coolant Temperature
Auxiliary Gage Communication: RS485.
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Oil Pressure
Operating Voltage: 8 VDC Minimum to 32
VDC Maximum.
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Fuel Economy
Operating Temperature:
-4 to 158°F (-20 to 70°C).
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Throttle Position
The UP and DOWN push buttons located on the
front of the MDDM, are used for scrolling through
the parameters and viewing the menu list. Two
LEDs (amber and red) are used to annunciate
active fault messages received by the MDDM.
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Manifold Air Temperature
Storage Temperature:
-40 to 185°F (-40 to 85°C).
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Current Fuel Consumption
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Active Service Codes
Shipping Weights (all models): 1 lb. (45 g.).
Shipping Dimensions (all models):
5-1/2 x 5-1/2 x 5-1/2 in. (140 x 140 x
140 mm).
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Stored Service Codes from the engine
Other components in the system are micro-
processor-based analog gauges for displaying
critical engine data broadcast by the ECM:
engine RPM, oil pressure, coolant temperature,
system voltage, etc., a combination audible
alarm and relay unit for warning and shutdown
annunciation. Up to 32 components may be
linked to the MDDM by an RS485 daisy chained
twisted pair cable up to 1,000 meters from the
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Set the Units for display
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View Engine Configuration
Parameters
Warranty
A limited warranty on materials and workmanship
is given with this FW Murphy product. A copy of
the warranty may be viewed or printed by going to
Applications
The Murphy Display and Diagnostic Module is a
low-cost solution for your instrumentation needs
on stationary or mobile equipment applications.
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