Zigen HDBaseT Switches - Manual (Page 17)

Matrix Switcher Series—User Manual
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Figure 6-2 HX-88 Connections
Figure 6-3 HX-1616 Connections
The HX-44/HX-88/HX-1616 supports up to 2/4/8 I/O modules for reparation or upgrade.
Each module can be configured individually based on module number. You can search
these module numbers by pressing PLUG and INFO keys simultaneously when you
want to upgrade firmware version.