The IKSRS6010 Input Board from Sony handles seven RS-422A data inputs. It supports a 38.4 kb/s signal rate. As the RS-422 input and output boards are handled as a pair, the input/output size can be expanded in units of seven inputs and seven outputs. The maximum number of RS-422 ports for the IXS-6700 is 112, and that for the IXS-6600 is 56.
Sony IKSRS6010 Specs
IXS-6600 Integrated Routing System
IXS-6700 Integrated Routing System