The configuration tool (2.3.11157) will not allow a FFCAN message to be a 0 length message (identifier only). When setup as 0 length, the error "No variables mapped for the message" is produced when saving or trying to create. If a variable is added, the start bit is set default at 0 and the end bit is set at default -1. This generates even more errors: "Start bit must be less than or equal to ending bit" and "Variable mapping start/end bit is greater than the message data length".

I am interfacing a Jaguar motor controller and some of its commands require the 29 bit identifier with no data.