Interfacing Clockaudio® microphones with the Logic Box
Contents
1. the mic signal The S135 also has various options to change the behavior of the switch and LED To set the options hold down the mute button while applying power to the mic either by plugging the mic cable in or by switching on phantom power The LED will flash for 2 seconds to indicate that you are in setup mode Then press the switch 1 4 times the interval between presses must be less than 1 second depending on which option you want to set see Figure 4 Once you have selected the option you want to change the LED will blink once for mode one or twice for mode two to indicate which mode that option is currently set to Then you can press the switch either once or twice to set the option to the desired mode See the table in Figure 4 below for the four available options and their modes After setting an option the LED blinks for 2 seconds again indicating that it is ready for you to select another option Otherwise if you don t press the switch for longer than 5 seconds the unit will exit setup mode and resume normal operation S135 The Clockaudio S135 is a microphone desk stand with a mute switch and a single color LED The desk stand has a 5 pin XLR connector with the following functions assigned to each pin Pin 1 Ground Pin 2 LED contact control input Pin 3 Audio Pin 4 Switch contact control output Pin 5 Audio The S135 operates in a similar way as the CH32 in that its LE2. Box and that button is normally open i e it creates a short circuit when the button is pushed then the Logic Box block will be generating a high logic signal when the button is not pushed and the logic signal will go low when the button is pushed However you may want the logic signal to be low when the button is not pushed and high when it is pushed In this case a NOT gate is the solution Flip Flop Gate A Flip Flop gate is used to transform a momentary logic pulse signal into a latching or toggle logic signal The Flip Flop gate works by toggling its output signal whenever its receives a low to high logic transition on its input It doesn t do anything when it receives a high to low logic transition So the first time it receives a low to high logic transition at its input it will send a high logic signal out of its output the next time it receives a low high logic transition it will start sending a low logic signal out of its output Logic State A Logic State block is a logic block which generates a logic signal It will generate a low logic signal if its Set button is disengaged and it will generate a high logic signal its Set button is engaged A common use for a Logic State block is to generate a logic signal and send it directly to the top nodes of a Logic Box block logic outputs This would allow you to manually control whether a logic output is opened or closed Logic Meter Logic Meters are a very useful trouble
3. Blue DC Brown To Logic Box logic outputs To Logic Box logic inputs 300 1W 300 1W Resistors required only if using a 24V power supply SM80S The Clockaudio SM80S is a table mounted shock mount with a switch and a single color LED The SM80S s 5 conductor tail is comprised of the following colors Brown DC Voltage Black Ground Orange Switch contact normally closed Red Switch contact normally open Blue Switch contact ground The SM80S works a bit differently than the CH32 in that the LED is turned on and off by applying and removing the DC voltage This is accomplished by using the Logic Box s logic outputs to connect and disconnect the power supply s path to ground Another difference is the option of a normally closed or a normally open switch contact Only one or the other needs to be used and the example below in Figure 3 uses the normally closed option The LED on the SM80S can use a 5V 12V or 24V power supply There is a small jumper on the SM80S which must be correctly set to correspond to the DC voltage being used The jumper is applied to a pair of pins on the SM80S s circuit board Apply the jumper to the outermost pair of pins i e closest to the outer edge of the circuit board when using a 24V power supply apply the jumper to the middle pair of pins when using a 12V power supply and apply the jumper to the innermost pair of pins when usi
4. The TS 001 s 5 conductor tail is comprised of the following colors Brown DC Voltage 12V Blue Ground Yellow Switch contact Red Red LED Green Green LED Older models of the CH32 had different color conductors than the ones listed above Check the included documentation to confirm the color code The TS 001 switch is powered by a 12V DC power supply and its dual color LED s are triggered by simple contact closures Therefore the pink and green conductors can be connected directly to logic outputs on the Logic Box Connecting the LED s to different logic outputs allows independent control of which LED is on You can also turn both red and green LED s on at the same time creating an amber light The capacitive touch switch causes a momentary contact closure between the yellow conductor and ground and can be connected directly to a logic input on the Logic Box Each TS 001 consumes one logic input and two logic outputs on the Logic Box so a maximum of six TS 001 s can be connected to a single Logic Box Figure 5 shows how to connect a TS 001 switch to a Logic Box Also of note is that the Clockaudio CS2S RF microphone can be wired to a Logic Box using the same wiring diagram as shown below Figure 5 TS 001 wiring detail The switch LED connections from a Clockaudio CS2S RF microphone can be wired to a Logic Box using the same wiring diagram Remote Control Bus 12 24VDC 600mW ter
5. models of the CH32 had different color conductors than the ones listed above Check the included documentation to confirm the color code Each LED will connect to a separate logic output on the Logic Box and the switch contact will connect to a logic input Therefore each CH32 uses 3 I O terminals on the Logic box meaning that a maximum of six CH32 s can be connected to one Logic Box For its DC power the CH32 can use either a 12V or 24V power supply and each CH32 consumes 40mA of current When using a 12V power supply the LED s can be connected directly to the Logic Box however when using a 24V power supply the LED s must be connected in series with a 300 ohm 1 watt resistor Figure 1 shows how to wire the CH32 to a Logic Box using either a 12V or 24V power supply Figure 1 CH32 wiring diagram Note that the 300 ohm resistors are only necessary when using a 24VDC power supply When using a 12VDC power supply the logic box outputs can be directly connected to the CH32 Remote Control Bus 12 24VDC 600mW term hi lo Logic inputs are activated via contact closure or 5V TTL Logic outputs are open collector 40V 500mA max per output INPUTS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 OUTPUTS 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 Logic Box status power 12V or 24V DC Power Supply Clockaudio CH32 Switch Yellow Red LED Red Green LED Green Ground
6. 8 Contact closure button recalls a preset and sends a serial string Figure 9 Using a momentary button to toggle the mute state of a mic as well as its LED state Figure 10 Two Logic Boxes connected to one unit one is ID 1 and the other is ID 2 The partial window above is the RCB tab of the Equipment Table
7. D is controlled by a contact closure rather than switching its power voltage on and off However the S135 is unique in that it uses the microphone s phantom power to light the LED rather than an external power supply Therefore no external power supply is required for use with the S135 Each S135 uses one logic input and one logic output on the Logic Box therefore up to 10 S135 s can be connected to a single Logic Box Figure 3 shows how to connect an S135 to a Logic Box Figure 4 Table showing the four options which can be set in an S135 Each option can be set to one of two modes For instance to set the S135 to Remote Mute mode first press the button four times to select option 4 then press the button twice to select mode 2 Remote Control Bus 12 24VDC 600mW term hi lo Logic inputs are activated via contact closure or 5V TTL Logic outputs are open collector 40V 500mA max per output INPUTS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 OUTPUTS 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 Logic Box status power Audio Pin 5 To Logic Box logic output To Logic Box logic input Audio Input AudiaFLEX or Nexia G Clockaudio S135 5 pin XLR 5 4 1 2 3 Switch Out Pin 4 Audio Pin 3 LED contact Pin 2 Ground Pin 1 TS 001 amp CS2S RF The Clockaudio TS 001 is a table mounted electronic touch switch with red and green LED s
8. Interfacing Clockaudio microphones with the Logic Box INTRODUCTION One popular application for the Logic Box is to interface with conferencing microphones that feature mute switches and LED indicators and Clockaudio is a leading manufacturer of such microphones This application note describes how to physically connect some of Clockaudio s most popular microphone accessories to a Biamp Logic Box Additionally the final section provides some tips on how to program the Logic Box to make the LED s and mute switches behave in different ways A BRIEF NOTE ABOUT POWER A common misconception about the Logic Box is that it is capable of supplying the DC power required to light up any LED s connected to it While the Logic Box does generate some voltage to facilitate the detection of contact closures and other functions it does not supply any appreciable current to power external devices In the first two examples below an external DC power supply is used to power the LED s This power supply is not included with either the Clockaudio microphones or the Biamp Logic Box CH32 LITETOUCH HALO WIRING The Clockaudio CH32 Litetouch is a dual color halo ring and switch combination which is used in concert with various through table microphones The CH32 s 5 conductor cable tail is comprised of the following colors Red Red LED Green Green LED Yellow Switch contact Brown DC Voltage Blue Ground Older
9. common way to make this happen The Flip Flop gate transforms the momentary logic signal to a latching signal and its output controls both the muting of the microphone and the state of the LED Using multiple Logic Boxes in a system If the application requires a lot of microphones you may be required to use multiple logic boxes to connect all of them In this case it s important to know how to identify each Logic Box In each Logic Box block there is a number in the top left corner and another number in the bottom right corner If these numbers aren t there go to Tools gt Options gt Display tab and select Display device assignment The number in the top right corner tells you which unit the Logic Box is assigned to This must correspond to the unit to which the Logic Box is physically connected If it is not set to the correct unit open the Properties sheet on the Logic Box block go to the DSP Attributes tab select the correct unit under Allocated to Unit and select Yes under Fixed In Unit to ensure that the compiler doesn t change which unit it s allocated to the next time you compile The number in the bottom right corner is the ID of the Logic Box itself and it allows you to identify each Logic Box individually This number will also show up in the RCB tab of the Equipment Table Tools gt Equipment Table and it will allow you to assign the correct serial number to the correct Logic Box Figure
10. m hi lo Logic inputs are activated via contact closure or 5V TTL Logic outputs are open collector 40V 500mA max per output INPUTS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 OUTPUTS 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 Logic Box status power 12V DC power supply Clockaudio TS 001 Switch Yellow Green LED Green Red LED Red 12VDC Brown Ground Blue To Logic Box logic outputs To Logic Box logic input Figure 6 Logic Box block LOGIC BOX PROGRAMMING Now that the microphone is physically connected to the Logic Box it s time to program it To program the Logic Box simply add a Logic Box block to the Audia or Nexia file for the system The nodes on the top of the Logic Box block represent the physical logic outputs on the device and the nodes on the bottom of the Logic Box block represent the physical logic inputs on the device There are only two states that a logic signal can be high or low on or off 1 or 0 The sections below describe how these two logic states interact with the Logic Box s logic inputs and outputs Logic Outputs The logic outputs on a Logic Box are what drive the LED s on the microphones By sending a logic signal to the top node of a Logic Box block corresponding to the logic output that you wish to control you can change whether that logic output is creating a short circuit to ground or an open circuit t
11. ng a 5V power supply Each SM80S consumes one logic input and one logic output on the Logic Box so up to 10 SM80S s can be connected to a single Logic Box Figure 2 shows how to connect an SM80S shock mount to a Logic Box Figure 2 SM80S wiring detail Note that only one of either the normally closed or normally open switch contacts will be used This example uses the normally closed switch contact which is generally preferred for Logic Box applications Remote Control Bus 12 24VDC 600mW term hi lo Logic inputs are activated via contact closure or 5V TTL Logic outputs are open collector 40V 500mA max per output INPUTS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 OUTPUTS 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 Logic Box status power DC power supply 5V 12V or 24V Clockaudio SM80S Switch NO Red Switch NC Orange Switch Ground Blue Ground Black DC Brown To Logic Box logic output To Logic Box logic input Figure 3 S135 wiring detail No power supply is required to power the LED Option Mode 1 Press once Mode 2 Press twice 1 Momentary Latching Switch Momentary Latching 2 Normally Off Normally On Normally Off Push to talk Normally On Push to mute 3 Activation Tone Off On Tone Off Tone On 4 Local Mute Remote Mute Local Mute S135 mutes the mic signal Remote Mute Audia Nexia mutes
12. o ground Sending a low logic signal results in a short circuit and sending a high logic signal results in an open circuit Logic Inputs The logic inputs on a Logic Box are what detect contact closures from the mute switches on the microphones When the switch connected to a logic input is closed shorted to ground a low logic signal is generated at the corresponding bottom node of the Logic Box block When the switch is open to ground a high logic signal is generated This means that logic inputs are normally high that is if there is nothing connected to a logic input it will be generating a high logic signal LOGIC GATES Logic gates can be used to transform logic signals in various ways To insert a logic gate into your configuration file select Logic Gate from the Control menu on the device toolbar click in your file to insert it and then select the type of logic gate you want to use It s not in the scope of this document to describe all logic gates in detail but below are a few that are commonly used with Logic Boxes For details on other logic gates consult the Help system in the Audia or Nexia software or the Audia Nexia user manual NOT Gate A NOT gate is a simple logic gate which inverts the logic signal that it is receiving In other words if you send a low logic signal to the input of a NOT gate it will output a high logic signal and vice versa For instance if you connect a contact closure button to a logic input on a Logic
13. shooting tool when programming a Logic Box because they allow you to view the state of a logic signal at any point in your logic circuit You can find Logic Meters in the Meters menu in the device toolbar Figure 7 Example logic circuit incorporating the Logic State NOT gate Logic Box Flip Flop gate and Logic Meter This circuit could be used to test a switch and an LED connected to logic input 1 and logic output 1 on the Logic Box EXAMPLE APPLICATIONS Contact closure button recalls preset A simple common application is to connect a contact closure button to a Logic Box and recall a preset whenever that button is pressed The key to making this happen is the Remote Preset block This block is triggered by a logic signal and recalls a preset whenever it sees a low to high logic transition To load a preset into a Remote Preset block open the block right click on the preset button and select Assign Preset Then choose the desired preset from the drop down menu If your contact closure button is normally open using a NOT gate as in Figure 8 will ensure that the preset gets recalled when you push the button down not when you let it up Contact closure button sends a serial string Also in Figure 8 notice that the same contact closure button is connected to a Command String block A Command String block operates the same way as a Remote Preset block but instead of recalling a preset it sends a custom string out of
14. the RS232 port on the unit This is useful for notifying a control system of an event that has happened You can also use a Command String block to send hex characters by preceding the two digit hex code with a tilde character Momentary contact closure mutes and unmutes a mic The Mute Control block has the capability of controlling its mute buttons via logic signals When dropping the Mute Button block into your file ensure that the Control Inputs check box is checked This will enable logic inputs on the block If the logic input for a channel receives a high logic signal it will mute the mic If it receives a low logic signal it will unmute the mic Keep in mind that all of the mic accessories discussed earlier in this document have momentary mute switches That is the switch is closed while you re pushing it down and open when you let it up If you connected this switch to a Logic Box and then connected a logic signal from the Logic Box directly to the Mute Control block it would only unmute the mic when you push the button down If you connected the Logic Box through a NOT gate and then to the Mute Control block it would mute the mic only while the button is held down More commonly users expect a toggle functionality where the mic will toggle on and off each time they press the button They might also expect the LED on the mic to turn on when the mic is live and turn off when the mic is muted The logic circuit in Figure 9 shows a
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