It polls as fast as it can communicate so higher speeds are faster response. Higher speeds also become more critical of the type of communication cables, how well it is shielded, and how much electrical noise is around. I would advise to use good quality 2 pair with each pair shielded, foil shields with a drain wire and keep the data cable away from any noise producing devices. Mount the semiSMINI,s and arduinos on something with a grounded metal plate or foil shield . Use good quality well filtered power supplies. Then run the baud rate as fast as you want that produces reliable communications.
Jim
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On Jan 6, 2019, at 18:41, JerryG via Groups.Io <jerryg2003@...> wrote:
I am setting up several Arduinos as CMRI SMINI nodes connected via RS485 and an adapter to a single USB port on my PC. JMRI will allow me to set the speed for the CMRI COM port connection from 9600 on up. Any reason not to go with the fastest speed? Any reason to just go with slow speed? Does this speed affect the rate at which JMRI polls the CMRI nodes (and if not, what does affect polling rate)?
Thanks, Jerry
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