Controlling device is RS232 and the receiving device is RS422.
Pelco Video Management, Pelco Matrix, Pelco Transmission & Power
Miss match in the Data standard
Pelco offers the PV140 (part number) RS232 to RS422 converter. The Converter Kit provides a bi-directional electrical interface between
RS232 and RS422 data ports. This allows any application that requires an RS232 device to connect to an RS422 or RS485 port on Pelco