Rane HAL1x Installation Guide - Page 74

HAL SYSTEM INSTALL GUIDE cable ends. This in turn connects the HAL/audio equipment rack grounding point and the metal (if used) junction box mounting the RADs and DRs. NOTE: For some electrical systems (e.g., isolated grounding systems - sometimes called a single point or star ground) the grounding procedure outlined above may short two fingers of the building ground system. If this creates a problem, then use of non-conductive junction boxes, or insulating mounting methods are recommended (or very much required!). The following graphic illustrates the T568-B termination and also shows the function of each wire pair on the RAD/DR network: Momentary and Latching Toggle Configuration All of the Logic inputs in the HAL system, including those in the HAL hosts, the DR4, and the DR5, allow you to configure each input port as a toggle and to specify them as either Momentary or Latching. What does this mean? When you have configured a Logic In port as a toggle, Halogen creates a corresponding toggle control in the Control palette of the Processing Workspace. You can then link this toggle control to one or more other toggle controls, which allows an external physical switch, relay, or another similar device to control the state of the toggle. For example, if you link a Logic In toggle control to the mute toggle control of an audio output processing block, and then attach a physical two-position switch to the Logic In port, the end user can mute or unmute the audio of the output block by changing the switch position. What is Momentary and how do I use it? One way to configure a Logic In port is to set it to Momentary. You use this setting if you intend to connect a momentary contact type of physical switch to the Logic In port, which could be a push button, for example. With a normally open momentary push button switch, the switch contacts are open when no one is pushing on the button and closed when someone pushes the button. Systems typically use these types of switches when the end user wishes to turn something on (for example open a wall) by pushing and releasing the button and then turning the same thing off (close the wall) by pushing the button again. This is exactly what the HAL system does when you have configured a Logic In port to be a Toggle and set it to Momentary. In this case pressing the button the first time sets the state of the corresponding toggle control in the Processing Workspace to 'checked' and pressing it again sets the toggle control to 'unchecked'. The following shows how this works in more detail using a DR5 input port, a momentary switch, and a Room Combine block wall toggle. First, the following diagram shows how to connect two normally open, momentary push button switches to DR5 Switch input ports. You should configure these ports as Momentary in the Hardware Workspace property dialog for the DR5. 68