Good morning everyone

I have Hmi proface with MPI port I want to link it to S7 315 2PN/DP using MPI port

in HMI manual MPI is RS 422 and the CPU is RS 485.

Is this communication possible or not??

I asked HMI support and they are not sure because HMI is very old one

Can any body help please

hi sherief, 

I found something on Wikipedia. 

The english wikipages tell something about both communication for it self. 

RS-422

RS-485

In the german 

EIA-485

you will find a chapter about RS485 and RS422. 

The last sentence may help you:

sherief

Good morning everyone

I have Hmi proface with MPI port I want to link it to S7 315 2PN/DP using MPI port

in HMI manual MPI is RS 422 and the CPU is RS 485.

Is this communication possible or not??

I asked HMI support and they are not sure because HMI is very old one

Can any body help please

 Hello sherief,

Have a look Rodrigo post perhaps might help you:

Proface comm. via MPI port - Entries - Forum - Industry ...

Siemens AG: SIMATIC S7 MPI Direct