Hi,
I have tried to find in the docs or forum if there is a mention of how many daisy-chained RTU Modbus slaves the Connect models can cope with, but I have not seen any definitive number anywhere.
In particular, we are looking to use the Connect S as an RS485 Modbus master over /dev/ttyRS485 for a project which might require more than 32 slaves, and we'd like to confirm if this is possible.
Many thanks.
Max number of clients/slaves of Connect over RS485?
Re: Max number of clients/slaves of Connect over RS485?
Hello Ulf, well, the maximum addressable Modbus-RTU Servers are 247
https://en.wikipedia.org/wiki/Modbus#:~ ... %20address.
But your idea is right per RS485 segment there may be a limitation to 32 devices on a serial line because of the serial driver.
https://en.wikipedia.org/wiki/Modbus#:~ ... %20address.
But your idea is right per RS485 segment there may be a limitation to 32 devices on a serial line because of the serial driver.
Re: Max number of clients/slaves of Connect over RS485?
Thank you, Dirk,
It's very encouraging to know that the Revolution Pi RS485 aligns with Wikipedia on RS485; but yes, it sounds like it will be a good idea not to promise more than 32 slaves for any one master without proper testing.
Many thanks,
Ulf
It's very encouraging to know that the Revolution Pi RS485 aligns with Wikipedia on RS485; but yes, it sounds like it will be a good idea not to promise more than 32 slaves for any one master without proper testing.
Many thanks,
Ulf
Last edited by ulf on 17 Apr 2024, 06:55, edited 1 time in total.
