UMAX140610. LIN
– J1939 CAN Protocol Converter with PWM Output. Version 1
Page: 8-81
ISO/OSI Network Model
Layer
J1939 Standard
Transport
N/A in J1939.
Session
N/A in J1939.
Presentation
N/A in J1939.
Application
J1939/71
– Vehicle Application Layer. Rev. APR 2014 with J1939DA –
Digital Annex. Rev. OCT 2014.
The converter can receive and transmit application specific PGNs. All
application specific PGNs are user programmable.
J1939/73
– Application Layer – Diagnostics. Rev. FEB 2010
Memory access protocol (MAP) supports: DM14, DM15, DM16
messages used by EA to program configuration parameters.
2.4.1 CAN Baud Rate
The converter can operate at J1939 standard 250 kbit/s and 500 kbit/s baud rates. It can also
run at 667 kbit/s and 1Mbit/s
– the maximum baud rate supported by the CAN hardware.
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 converter
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 converter 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
0 (Global)
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
25 (Network Interconnect ECU)
No
Function Instance
5 bit
25 (AX140610, LIN
– J1939 CAN,
Axiomatic with PWM Output
proprietary)
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
The user can change the converter
ECU Instance
using EA to accommodate multiple
converters on the same CAN network.
