17
CAN Error Diagnostic Codes:
In many cases, when a problem is detected with the CAN bus, one or
both Tri
Mark
CAN-enabled devices will announce an error. Similar
codes are used with CAN vehicle module and CAN keypad. The
keypad uses back lighting and buzzer for announcing codes while the
vehicle module uses an internal red LED.
1. At power up, the CAN devices will attempt to claim their preferred
network address on the CAN bus. After this, they will announce a
successful power-up using either the internal LED or a buzzer and
backlighting.
This “long announcement" communicates a CPU reset and why:
One 1-second announcement = normal power on
Two 1-second announcements = watchdog timer reset the
CPU (this indicates a software bug)
Three 1-second announcements = brownout reset. The
power supply fell below the 2.0V requirement momentarily.
2. After the long announcement, a series of "short announcements"
indicate other errors that may have occurred:
Two short announcements = CAN bus error. This means
there is an electrical problem with the CAN bus (possibly a
problem with bus termination), or simply that the device
reporting this error is the only node attached to the bus. If
there is intentionally only one CAN-enabled device on the
network, CAN communication must be disabled for normal
operation.
Three short announcements = the device reporting this
error couldn't claim its preferred CAN address. This is
probably because another device on the bus is set to the
same function instance. This is considered a fatal error so
the device will reset itself and try again.
3. For some problems, the keypad provides five short beeps followed
by a pause to indicate a CAN bus error. Make sure that both
network wires are intact and connected to all TriMark CAN-
enabled devices.
Summary of Contents for 24324-02
Page 32: ...UM26 24324 02 12 13 4...
