Modbus Communication in AC900F
I want to know that can i use Com1 or 2 of Redundant Ac900F Controller?
If yes then should i connect it in daizy chain means multidrop?
2nd: Is it necessary to use pull-up and pull down ressitanaces if yes then i should use it at only one controller?
Thanks in Advance.
Voted best answer
The manual 2PAA109295_M&I for AC900F controller has everything You need to know. In short the correct connection depends on if You are using RS232 or RS485. See attached part of the manual as a reference.
Hope this helps,
Source: 2PAA109295_M&I AC900F Controller