BON ELECTRONICS BSM-093N3G User Manual page 7

8) DC Input
For DC power supply. Check the DC Input voltage. In case of using the Battery
power, DC 12 ~ 24V is usable.
9) Update Port
The Serial communication terminal that for changing the operating
program(Firmware) of the body or controlling the monitor.
10) Remote Ethernet Port
External control via PC is able with this port by using 'Wall Control Program'.
Firmware is also updatable through this port.
11) USB Port
USB Firmware Update Port.
12) Audio IN/OUT
Audio Line In/Out Port
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