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This keyboard is supported on stations with Windows 7 or Windows Server 2008 R2 operating systems. Each LED, under control of the workstation processor's software, may be ON, OFF, or FLASHING as determined by the process conditions. These LEDs, when used in conjunction with the unit's audible annunciator, form an effective means of calling a user's attention to specific areas of the system. The switch associated with each LED may be used to invoke any pre-configured displays or operator responses. Labels for each key, which may contain the LED/switch names, are inserted in a recess under the clear plastic shield inset into each key. This keyboard includes an alarm relay - a two-pole device. One pole is used to activate an external device, such as driving an alarm horn, while the other pole is used internally to detect that the relay switch has closed. This self-check operation verifies the functionality of this relay even if this device activation functionality was disabled by the keyboard’s configuration application. The USB annunciator keyboard is connected to its host either directly to one of the host’s USB ports, or through a USB hub which connects to the host via a USB cable. Extended connections from 1.8 m (6 ft) to 30.5 m (100 ft) require the kits listed in “EXTENDED CONNECTION KIT FOR USB ANNUNCIATOR AND ANNUNCIATOR/NUMERIC KEYBOARD” on page 5. Unlike other USB I/A Series station peripherals, it cannot be connected through a Remote Graphics Unit (RGU). As well, stations with USB annunciator keyboards cannot have a serial card installed in them, nor can they use a GCIO interface module. Each annunciator switch location has LEDs that can be configured for one of the following states; red, yellow, green, or off (no color). USB ANNUNCIATOR/NUMERIC KEYBOARD The USB annunciator/numeric keyboard (P0924WV) has four rows of eight keys plus a row of 12 macro keys at the top. These keys have LEDs next to them, except the 12 macro keys, and also provide for the insertion of polyester labels. This keyboard also includes four arrow keys around a Select key. The keypad section is suitable for entering numeric data into the system. As well, each keyboard has a Silence Horn key and a Lamp Test key. These two illuminated buttons are on the far left side, with the Lamp Test key over the Silence Horn key. It is supported on stations with Windows 7 or Windows Server 2008 R2 operating systems. This keyboard includes an alarm relay - a two-pole device. One pole is used to activate an external device, such as driving an alarm horn, while the other pole is used internally to detect that the relay switch has closed. This self-check operation verifies the functionality of this relay even if this device activation functionality was disabled by the keyboard’s configuration application. The USB annunciator/numeric keyboard is connected to its host either directly to one of the host’s USB ports, or through a USB hub which connects to the host via a USB cable. Extended connections from 1.8 m (6 ft) to 30.5 m (100 ft) require the kits listed in “EXTENDED CONNECTION KIT FOR USB ANNUNCIATOR AND ANNUNCIATOR/NUMERIC KEYBOARD” on page 5. Unlike other USB I/A Series station peripherals, it cannot be connected through a Remote Graphics Unit (RGU). As well, stations with USB annunciator/numeric keyboards cannot have a serial card installed in them, nor can they use a GCIO interface module.