UMAX0608XX‐1000. Tri‐Axial J1939 CAN Inclinometer. Version 9B
Page: 18-66
2.4.1 CAN Baud Rate
The inclinometer can operate at J1939 standard 250kbit/s and 500kbit/s baud rates. It can also
run at 667kbit/s and at 1Mbit/s – the maximum baud rate supported by the CAN inclinometer
hardware.
1
1
Inclinometers with firmware V1.xx…6.xx could operate only at 250kbit/s baud rate, and with firmware
V7.xx…8.xx – at 250, 500, and 1000 kbit/s (1Mbit/s) baud rates.
The baud rate selection is performed automatically upon connection to the CAN network using
passive and active automatic baud rate detection process described in J1939/16. Once
detected, the baud rate is stored in non-volatile memory and used on the next inclinometer
power-up.
The baud rate detection can be disabled for permanently installed units to maintain the desired
baud rate on the CAN network.
2.4.2 J1939 Name and Address
Before sending and receiving any application data, the inclinometer claims its network address
with a unique J1939 Name. The Name fields are presented in the table below:
Table 3. J1939 Name Fields
Field Name
Field Length
Field Value
Configurable
Arbitrary Address Capable
1 bit
1 (Capable)
No
Industry Group
3 bit
3 (Construction Equipment)
No
Vehicle System Instance
4 bit
0 (First Instance)
No
Vehicle System
7 bit
0 (Nonspecific System)
No
Reserved
1 bit
0
No
Function
8 bit
136 (Slope Sensor)
No
Function Instance
5 bit
5
2
– AX060800, AX060806, AX060807,
AX060808, AX060830, AX060838,
AX060810, AX060811;
7
2
– AX061000.
No
ECU Instance
3 bit
0 (First Instance)
Yes
Manufacturer Code
11 bit
162 (Axiomatic Technologies Corp.)
No
Identity Number
21 bit
Calculated on the base of the
microcontroller unique ID
No
2
Axiomatic proprietary values for Tri-Axial J1939 CAN Inclinometers.
The user can change the inclinometer
ECU Instance
using EA to accommodate multiple units
on the same CAN network.
The inclinometer takes its network
ECU Address
from a pool of addresses assigned to self-
configurable ECUs. The default address can be changed during an arbitration process or upon
receiving a commanded address message. The new address value will be stored in a non-
volatile memory and used next time for claiming the network address. The
ECU Address
can
also be changed in EA.
