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©2021 Sharp NEC Display Solutions, Ltd. Page 20 of 86
3 Connections and Internal Operation
3.1 USB device connections to the Compute Module
The two USB Type-A inputs on the side of the Interface Board are for connecting downstream USB
devices, such as a keyboard and mouse, additional storage, external sensors and devices, or a Wi-Fi
adapter, to the Compute Module. Both connectors are USB 2.0 and can supply 500mA of current each.
On some display models
1
there is an additional USB input on the display itself labeled “USB-A” that can
be switched between the Compute Module, Internal PC (SDM), and an external PC connected to the
USB-B connection on the display. It can be configured via the display’s OSD “PC SOURCE” setting (see
section 6.18 on page 51) to switch automatically depending on the currently selected video input or fixed
to a specific source. This allows devices such as a mouse or other input device to be shared
automatically between different sources.
For display models
1
that have been integrated with an optional 3
rd
party touchscreen, the internal USB
connection from the touch sensor will also follow the “PC SOURCE” setting so that as video inputs on the
display are changed, the touchscreen connection will automatically switch to the correct source device.
Figure 3.1-1: USB Device Connection
3.2 USB connections for programming the Compute Module
To program the Compute Module, an external “host” PC is connected to the USB Micro-B connector on
the Interface Board. The Boot Mode switch on the side of the Interface Board should be moved to the
position towards the USB connectors and the display powered on. After running the “rpiboot” utility, the
Compute Module 4 will then appear as a USB device to the “host” PC, allowing it to be programmed.
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Current display models with a “USB-A” port on the terminal panel and PC SOURCE in the OSD menu: MA431,
MA491, MA551, P435, P495, P555
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