NCR 5932, Руководство пользователя

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Chapter 1: General Overview 1-11
Error Tone
Both PS/2 and USB keyboards incorporate the ability for host software
to evoke an error tone at the keyboard using the key click speaker. The
capabilities are comparable.
MSR
Both PS/2 and USB keyboards provide an optional 3-track MSR in
either ISO or JIS head configurations. The PS/2 keyboard cannot
detect if the MSR is present.
The USB keyboard implements the MSR as a separate USB HID device,
conforming to the published HID standard for MSR devices. As with
the Keylock, the PnP feature of USB communications makes it a simple
matter for the host computer and thus the customer’s application to be
aware of the presence or absence of the MSR.
Scanner port
The PS/2 keyboard contains an NCR-proprietary RJ-45 connection for
RS-232 based scanners. This port has technical limitations and a limited
subset of NCR scanners are qualified.
The USB keyboard has no RJ-45 connector for RS-232 scanners.
However see
Additional Port .
Additional port
The PS/2 keyboard has no additional ports beyond the Scanner port.
The USB keyboard provides a standard USB port connection to one of
the internal hub’s ports. This connection permits a USB scanner, or for
that matter, any standard USB device to be connected through the
keyboard to the host computer.
Power LED
The PS/2 keyboard has an LED that indicates when power is present.
The USB keyboard has no such LED.