PROALL P Series, Service Manual, Page: 83 / 118

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13.2 CANBUS NETWORKS
IMPORTANT!
The Commander mixer has three active networks and one programming network. The active networks are
CAN2, CAN3 and PRINTER CAN. The programming network is on CAN1 and is used strictly for downloading ECU
updates. The CAN2 network uses the J1939 protocol running at 250kbit/s and CAN3 is CANOpen running at
125kbit/s. The CAN2 network is primarily used for input and output device communication. The CAN3 network
is the communication used between the ECU and the display. The PRINTER CAN network is connected to the
CAN1 port of the display and is used strictly for sending coded CAN messages that are converted to ASCII for
printing.

All CAN networks are terminated at each end with 120ohm
resistors. When testing CANBUS resistance you should have
a total of 60ohms nominal between the CAN H and CAN L
terminals when the power is
off . A range of 55-65ohms is
typical.

There are CAN resistors inserted on the circuit board
that serve as the start of the network for CAN 1,2 and 3.

The CAN2 end terminating resistor is in the M12 CAN
splitter block mounted inside the hydraulic valve cabinet.

The CAN3 and PRINTER CAN end terminating resistors can
be found in the display box terminals . The PRINTER CAN
module has its own terminating resistor and is mounted
inside the console in the cab.

The Electrical Diagnostics screen on the Commander
display can be used to monitor all CAN2, CAN3 and PRINTER
CAN networks. The nodes will be red if not communicating
and if all nodes are red then the network is down.

If the CAN3 network (display) is down, greyed out boxes
with dashed lines will appear on the screen indicating
that a connection to the ECU is broken.
A
A
B
C
A
B
A
C
A
D
D