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CAN/J1939 Interface
DESCRIPTION AND OPERATION
The CEN A2-326 digital regulator is compatible with
SAE J1939 communications standard for vehicle net-
working.
CEN uses MIL-STD connector MS3112E12-10P to inter-
face between the A2-326 and the vehicle J1939 databus.
Mating connector is MS3116E12-10S or equivalent.
If J1939 connection is not used, the 10-pin connector
must be covered with connector cover MS3181-12CA or
equivalent. Message content is shown in Table 2.
Regulator Readout
Alternator Output Voltage 28 V System
Alternator Speed
Regulator Temperature
Alternator Output
Charging System Hours
PGN Name
PGN
ALT RPM
0xFED5
ALT VOLT
0xFEF7
ALT TEMP
0xFEA7
PROPRIETARY #1
0xFFC8
PROPRIETARY #2
0xFFC9
TG0048A
TG48B
TABLE 2 – A2-326 Regulator/J1939 Readout Diagnostics (see Table 3)
Expected Reading
13–15 V
1200 to 8000 RPM
Less than 257 F/125ºC
0–100%
>0 hours
TABLE 3 – Message Data
Byte 1
Byte 2
Byte 3
ALT RPM
VOLT SETPOINT
BATT
SHUTDOWN
BATT AGE
CURRENT
COUNT
Section 2: CAN/J1939 Diagnostics
Section 2: CAN/J1939 Diagnostics
TABLE 1 – J1939 Connector
Circuit Identi cation
Identi cation
Pin
A
CANH
B
CANL
C
CAN SHIELD
D
Battery
E
Mfr use only
F
Mfr use only
G
Mfr use only
H
Temperature sensor
J
Voltage sensor
K
Current sensor
Action—If Expected Reading Not Present
See Chart 1, page 6.
Check drive belt and charging system connections.
Decrease load on alternator.
Varies with load.
Check drive belt and charging system connections.
Byte 4
Byte 5
ALT VOLT
REG IGN VOLT
REG TEMP
BATT TEMP
HOUR METER
Proprietary Content: For Manufacturer Test Only
Figure 4 – J1939
Connector Pins
Byte 6
Byte 7
Byte 8
BATT VOLT
MINUTES
ALT LOAD
(0-59)
Page 3
Page 3
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