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8.2. LoadMaxx Messages
The C220 Controller assumes that the Air-Weigh
®
LoadMaxx™ scale is using its
default address of 180 (B4 hexadecimal). If the scale is using another address, contact
Aarcomm for instructions for configuring the C220 Controller to find the scale on a
different address. (Note: Newer C220 firmware may be able to search-for and find the
address of the scale, in which case configuration is unnecessary.)
During operation, the C220 Controller sends a request for Gross Combination
Vehicle Weight (PGN 64872), once per second, to the scale using a standard J1939
Request PGN (59904, EA00 hexadecimal). The weight information contained in PGN
64872 returned from the scale is used to generate the weight display in the H212
Handheld’s primary function display.
Additionally, the C220 Controller monitors the Active Diagnostic Trouble Codes
(PGN 65226) which the scale automatically sends once per second, and extracts the
Amber Warning Lamp (AWL) and FMI (within DM1) values in order to tell when to
indicate the approaching-weight-limit warning and over-weight alarm. Note that the scale
must be configured properly via its dashboard-mounted display with the weight warning
and alarm limits.
