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244
Figure 9-128 Protocol Button Screen
The following protocols are included:
High Speed CAN — offers baud rates from 40 Kbit/s to 1 Mbit/sec, depending on
cable length. This is the most popular standard for the physical layer, since it allows
for simple cable connection between devices. High speed CAN networks are
terminated with 120 ohm resistors on each end of the network.
Low Speed CAN — offers baud rates from 40 Kbit/s to 125 Kbits/sec. This standard
allows CAN bus communication to continue in case of a wiring failure on the CAN
bus lines. In low speed CAN networks, each device has its own termination.
Single CAN — offers baud rates up to 33.3 Kbit/s (up to 88.3 Kbit/s for high-speed
mode)
J1939 CAN — is used in the commercial vehicle area for communication
throughout the vehicle with the physical layer defined in ISO 11898. Under J1939/11
and J1939/15, the data rate is specified as 250 Kbit/s, with J1939/14 specifying 500
Kbit/s.
J1850 (PWM) — SAE J1850 pulse-width modulation offers baud rates up to 41.6
Kbit/s, standard of the Ford Motor Company
J1850 (VPW) — SAE J1850 variable pulse width offers baud rates up to 10.4 Kbit/s,
standard of the General Motors
J1708 (SAE) — the standard defines a double-wire 18-gauge cable that can run up
to 130 feet (40 m) and operates at 9600 bit/s
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