9400200990 Rev I DGC-2020 Functional Description 3-5
USB
The rear-panel, mini-B USB socket enables local communication with a PC running BESTCOMSPlus
software. The DGC-2020 is connected to a PC using a standard USB cable. BESTCOMSPlus is a
Windows
®
based communication software package that is supplied with the DGC-2020. A detailed
description of BESTCOMSPlus is provided in Section 4, BESTCOMSPlus Software.
CANBus
A Control Area Network (CAN) is a standard interface that enables communication between multiple
controllers on a common network using a standard message protocol. DGC-2020 controllers have a CAN
interface that supports the SAE J1939 protocol and the MTU/MDEC protocol.
Applications using an engine-driven generator set controlled by a DGC-2020 may also have an Engine
Control Unit (ECU). The CAN interface allows the ECU and DGC-2020 to communicate. The ECU reports
operating information to the DGC-2020 through the CAN interface. Operating parameters and diagnostic
information, if supported by the ECU, are decoded and displayed for monitoring.
The primary use of the CAN interface is to obtain engine operating parameters for monitoring speed,
coolant temperature, oil pressure, coolant level, and engine hours without the need for direct connection
to individual senders.
Table 3-1 lists the ECU parameters and Table 3-2 lists the engine configuration
para
meters supported by the DGC-2020 CAN interface. These parameters are transmitted via the CAN
interface at preset intervals. See the column labeled Update Rate in
Table 3-1 for transmission rates. This
informatio
n can also be transmitted upon user request.
CAN interface connections are made at 48 (CAN L), 49 (CAN H), and 50 (SHIELD).
Table 3-1. ECU Parameters Obtained from CAN Interface
ECU Parameter
Metric
Units
English
Units
Update Rate
Decimal
Place
∗
SPN
Actual engine percent torque % % engine speed
dependent
none 513
Air filter differential pressure kPa psi 500 ms 100
th
107
Air inlet temperature kPa
°F
1 s none 172
Ambient air temperature
°C °F
1 s 10
th
171
Barometric pressure kPa psi 1 s 10
th
108
Battery voltage Vdc Vdc 1 s 10
th
168
Boost pressure kPa psi 500 ms none 102
Coolant level % % 500 ms 10
th
111
Coolant pressure kPa psi 500 ms 10
th
109
Engine coolant temperature
°C °F
1 s none 110
Engine intercooler temperature
°C °F
1 s none 52
Engine oil level % % 500 ms 10
th
98
Engine oil pressure kPa psi 500 ms 10
th
100
Engine oil temperature
°C °F
1 s 10
th
175
Engine speed rpm rpm engine speed
dependent
none 190
Exhaust gas temperature
°C °F
500 ms 10
th
173
Fuel delivery pressure kPa psi 500 ms 10
th
94
Fuel rate liter/hr gal/hr 100 ms 100
th
183
Fuel temperature
°C °F
1 s none 174
Injection control pressure MPa psi 500 ms none 164
Injector metering rail pressure MPa psi 500 ms none 157
Intake manifold temperature
°C °F
500 ms none 105
Percent load at current rpm % % 50 ms none 92
Switched battery voltage (at
ECU)
Vdc Vdc 1 s 10
th
158
Throttle (accelerator pedal)
position
% % 50 ms 10
th
91
Total engine hours hours hours requested 1.5 s 100
th
247
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