Posted 6 Aug 2017 Hello. I have tested different type of communication between by rs485 fx3u and fx5u. On fx3u side used fx3u-485-adp-mb. In case of N:N and Parallel Link fx5u is more comfortable than fx3u. But, modbus rtu not so good. I made 3 tests: 1)FX3u master with ADPRW function; ADPRW in fx3u supports wider count of modbus functions, most usefull for me is H17 (Read/Write multipleregisters). But when i send telegram to Fx5u with this function, fx5u fall in error (recieved unsupports serial com functions). i have checked instruction manual on ADPRW - FX5u doesn't support H17, only H03 and H10. For read/write from fx5u need to use 2 instructions on FX3u side. 2)FX5u master with ADPRW function; In this test ofcourse i tried use H17, but result was expected - error. 3)FX5u master with predifined protocol. In this test using H17 function on Fx5u side was successful. Conclusion: FX5u better use as master for modbus rtu communications via predifined protocols, and if it used as slave need remember that it doesn't support H17. I hope this information will usefull for sombody. Share this post Link to post Share on other sites
Posted 21 Aug 2017 Hi Clear.Mind! When using fx5u as master - do you know where to find each slave status? sm8500 ? Thnx. Share this post Link to post Share on other sites
Posted 2 Sep 2017 On 21.08.2017 at 7:36 PM, eziccc said: Hi Clear.Mind! When using fx5u as master - do you know where to find each slave status? sm8500 ? Thnx. Yes, you can check sm8500 status after completation of instruction, but I have used binary output array of completation status of ADPRW or S_CPRTCL. (Head device number which turns ON when the execution of the instruction is completed and remains on for 1 scan.If the instruction is completed with an error, (d)+1 is alsoturned on.) Share this post Link to post Share on other sites