In SX Microcontrollers, SX/B Compiler and SX-Key Tool, rmayhew wrote:

For me it just seems easier to service Comms at the end of the main because its scanned continuously, and leave the ISR to flag my timing bits for automation sequences. A simple soft test can tell if the ISR was delayed because of Comms, but I can flag the next ISR to be shorter to balance the timing issue, then return the ISR back to its origanl count in after the correction.

   I've had good success with packet assembly, my next project will use modbus addressing. If the subroutine can be developed that is small enough maybe it can be offered with SX/B.

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