Communication problem with Modbus:
SCM2214 -- SCA72 -- PC. I need connection of scm2214 with sca72 and serial PC port.

 

Your question is way too general. It could be due to a number of factors.

If there is transmission/receival of data but communication is still not occuring as desired, a protocol analyzer might be useful in troubleshooting.

Imperious Technology sells a cheap one at imperioustech.com