Pokini FT 7M, Manual

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communicating with the vehicle’s computer, also known as the ECU (Electronic Control Unit). A wealth of information
can be obtained by tapping into the OBD bus, including the status of the malfunction indicator light (MIL), diagnostic
trou-ble codes (DTCs), inspection and maintenance (I/M) information, freeze frames, VIN, hundreds of real-time para
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meters, and more.
3.7.2 Support protocol
• ISO 15765-4 CAN (11 bit ID, 500 kbaud)
• ISO 15765-4 CAN (29 bit ID, 500 kbaud)
• ISO 15765-4 CAN (11 bit ID, 250 kbaud)
• ISO 15765-4 CAN (29 bit ID, 250 kbaud)
• SAE J1850 PWM (41.6 kbaud)
• SAE J1850 VPW (10.4 kbaud)
• ISO 9141-2 (5 baud init)
• ISO 14230-4 KWP (5 baud init)
• ISO 14230-4 KWP (fast init)
3.7.3 Application fields
• Academic project
• Vehicle diagnostic scanning tools
• Digital dashboard
• Fleet tracking and management
• OBD data-logging record
3.8 J1939 Interface (optional)
3.8.1 Overview
The J1939 interface of is recommend for heavy-duty truck applications. And it supports SAE J1939 and SAE J1708/
J1587 protocols.
SAE J1939 (hereinafter referred to as J1939) is the recommendation of Society of Automotive Engineers (SAE),
which provides a standard architecture for com-munications between electronic components on medium-heavy
vehicles. It is developed and written by Track & Bus Control and Communications Network Subcommittee, which is
the subordinate of Track & Bus Electrical & Electronics Committee.
J1708 is a SAE standard based on the RS-485, which can be used in agricul-tural vehicles, commercial vehicles and
heavy machinery, and is released and maintained by the SAE. Mainly used for serial communication between the
heavy vehicle ECU or between the vehicle and the computer. It‘s associated with the OSI model, J1708 mainly defines
the physical layer. The usual high-level protocol to run on J1708 is SAE J1587 (TMC/SAE joint of microcomputer
system for electronic data interchange in heavy vehicles) and SAE J1922 (used for electronic control transmission
interface of diesel vehicles for medium and heavy roads).