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Biamp Cornerstone

Connecting Clockaudio microphones and mounts to an EX-LOGIC

One popular application for the Tesira EX-LOGIC is to interface with conferencing microphones that feature mute switches and LED indicators, and Clockaudio is a leading manufacturer of such microphones and microphone mounts.  This article describes how to physically connect Clockaudio microphones and mounts/stands to a Tesira EX-LOGIC expander.

This article specifically deals with Clockaudio products that have a 5-conductor cable terminated to an RJ45 connector.  For Clockaudio table-top desk stands with XLR connectors, see Connecting a Clockaudio microphone desk stand to an EX-LOGIC.


After completing the steps in this article, you will be able to connect a Clockaudio microphone or mount to a Tesira EX-LOGIC.  This will allow your Tesira configuration to control the LED's on the device, and it will also allow the microphone's switch to control functions within your Tesira configuration (like mic muting).  Some Clockaudio products have multi-color LED's (red/green), others have single-color LED's; some have mechanical mute switches, others have touch-sensitive switches.  Regardless of the model used, all Clockaudio products that have an RJ45 cable use the same wiring scheme, described below.

While the EX-LOGIC can supply up to 5VDC/10mA from each logic output (if they are configured as "powered" logic outputs), this is not a sufficient amount of power for most Clockaudio microphones.  Therefore, an external power supply is required to power the LED's.  This power supply is not included with either the Clockaudio product or the Biamp EX-LOGIC.

Conductor colors

Each Clockaudio device has a 5-conductor cable tail attached to it, which is terminated to an RJ45 connector.  When connecting the device to an EX-LOGIC, the RJ45 connector is sometimes cut off.  

Older models of many Clockaudio products had different color conductors and/or pin numbers than the ones listed here (and in some cases, they may have had different DC voltage requirements as well). Check the included Clockaudio documentation to confirm the wiring scheme and voltage requirements.

The 5-conductor Clockaudio cable tail is comprised of the following colors:

Conductor Color RJ45 Pin Number Clockaudio function EX-Logic
Red 2 Red LED Logic Out
Blue 3 Ground Ground
Brown 4 DC Voltage +  
Yellow 5 Switch contact Logic In
Green 6 Green LED Logic Out




An EX-LOGIC has 16 Logic I/O connections.  Each Logic I/O can either be used as an input or an output (but not both), and input/output status of each terminal is determined by the Tesira programming.  The diagrams in this article arbitrarily show logic inputs as channels 1-8, and logic outputs as channels 9-16, but the Tesira programming can define the inputs and outputs differently.

Each microphone's LED conductor (up to 2 per mic) must connect to a separate logic output on the EX-LOGIC, and each switch contact must connect to a logic input.

Clockaudio devices require a 12V power supply. The diagrams below shows how to wire a Clockaudio device (with red and green LED's) to an EX-LOGIC using a 12V DC power supply. The EX-LOGIC should be configured using the Logic Output block (not the LED Driver):

clockaudio-generic-exlogic2.PNGClick the diagram for a full-size view. This diagram applies to the following microphone models:

  • CH32 / CH32W
  • TS001 / TS001W
  • SM80S-PTT / SM80SN-PTT
  • SM80S-Latch / SM80SN-Latch
  • SM80S-RF-Latch / SM80SN-RF-Latch
  • SM80S-X5-PTT / SM80SN-X5-PTT
  • SM80S-X5-Latch / SM80SN-X5-Latch
  • S80S-PTT / S80S-Latch
  • CS1S-RF / CS1SN-RF
  • CS2S-RF / CS2SN-RF
  • CS3S-RF / CS3SN-RF
  • CS4S-RF / CS4SN-RF
  • CRM202S-RF / CRM202SN-RF

Further reading