printing in CP635 HMI through serial com port
Through Serial port you can not directly print..
You have to check in your printer user manual...
Basically you can send some ASCII comands to printer, But this ASCII comands format you will get it in your printer user manual.
Generally this kind of interfacing is to be used in BARCODE PRINTERS.
You can check your printer with windows hypertermeinal if it is compatible with it then it can be interfaced with PLC or HMI also through ASCII protocol.