Black Box ACU3009A Specifications download pdf (Page 28)

CHAPTER 5: Configuration

5.2 Setting DIP-Switch Position 2: Keyboard-Command Recognition

The function of DIP-switch position 2 depends on the Micro Extender model:

• On the ACU3001A and ACU3009A Remote Units, position 2 controls how the

Remote Unit handles [Scroll Lock]. Normally, pressing [Scroll Lock] on the

Remote Unit’s attached keyboard causes the Extender to reset itself (see

Section 7.3.1) or, in Dual-Access systems, to go into Private Mode (see

Section 7.3.4). But the Extender treats this keypress as a command and

absorbs it, so there’s no way to send [Scroll Lock] to the PC or KVM switch

attached to the corresponding CPU port on the Extender’s Local Unit.

Leave position 2 of the Remote Unit’s DIP switch in the factory-default UP

(OFF) setting if [Scroll Lock] isn’t necessary for your application and can

continue to be used to trigger reset/Private Mode on that Local Unit CPU

port. If you need to be able to use the [Scroll Lock] key for something else on

that port, move position 2 to the DOWN (ON) setting to disable reset and

Private Mode and cause the Extender to pass [Scroll Lock] through to the

attached PC or switch.

• On the ACU3022A Remote Unit, position 2 controls the Remote Unit’s keyboard-

command hotkey, the character that you can send from the attached keyboard

to cue the Extender to expect to receive a command. Each time you press the

hotkey, it will be absorbed by the Extender if it’s followed by a valid command

character.

The hotkey can be either left-[Ctrl] or right-[Ctrl]. In position 2’s factory-

default OFF setting, right-[Ctrl] is the hotkey. But you might want to use left-

[Ctrl] instead, particularly if (a) a KVM switch you’ll be attaching uses right-

[Ctrl] as its command hotkey, or (b) a computer you’ll be attaching to the

Extender is a workstation such as a Compaq Alpha, HP, etc. (Instead of a

standard right-[Ctrl] key, these workstations’ keyboards have a [Compose] key,

which shouldn’t be absorbed by the Extender because it’s required for use

with some of the software written for these workstations.) To have the Remote

Unit use left-[Ctrl] for its hotkey, move position 2 to ON. (If neither right- nor

left-[Ctrl] are suitable for this purpose in your application, please call Black

Box Technical Support.)

NOTE

The hotkeys of the ServSwitch Multi, ServSwitch Multi Z8, and

ServSelect can be set to keypress sequences such as two consecutive

left-[Ctrl] or right-[Ctrl] keys. This could cause conflicts that confuse the

switch if you’re using one of these ServSwitch models with the

ACU3022A. To avoid such conflicts, you should set the hotkey of the

ServSwitch to some completely different key ([Shift], for example) or to

a keypress sequence that doesn't include either [Ctrl] key.

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Black Box ACU3009A Specifications Page 28