GPIO

General Purpose Input Output (GPIO) has been a common function in radio studios for many years. Though AoIP has changed the way in which components interface with one another, logic states between gear remains widely depending on this legacy method of wiring.

From the beginning, Axia has endeavored to make the process of configuring GPIO as plug-and-play as possible, and the strategy used to achieve this has been to define behavior through the use of profiles. Each Source Profile (as outlined in Chapter 3) defines how the 5 GPI, 5 GPO, and 15 pin GPIO ports behave based upon how each is expected to be employed in a typical studio. Information about each Source Profile plus tables for GPIO ID and pin-outs are provided below.

Source Profiles

Source profiles include:

• Line Input – Used for any general audio source.

• Computer Player – Similar to Line Input, but with a different logic control commonly found with PC-based automation systems. For example, pressing the “On” button while the source is already in the “on” state triggers the next event in the automation.

• Phone – Defines the source as a hybrid or broadcast phone system input. Single line phone hybrids commonly want the line to be seized when a state is changed on the console, such as when the channel is turned on or set to a preview state. A summed mono mix-minus is automatically created for the source, and controls for Telos products will be available.

• Codec – Links to remote codecs often require a GPIO to trigger IFB communication and a dual mono mix-minus for the source consisting of one PA feed (right channel) and one talent feed with talkback (left channel).

• Operator Microphone – This is the board op’s mic which often requires different GPIO functions than other studio microphones.

• CR Producer Microphone – The in-studio producer’s mic may not have access to the console but often requires the same controls as the operator.

• CR Guest Microphone – Used for any other mic in the control room.

• Studio Guest Microphone – Similar to the CR Guest Microphone, but with different monitor muting requirements.

• External Microphone – Used for any mic located outside of the CR or studio, this functions like a Guest microphone but without any muting logic.

• Studio Feed – Typically a source that receives a backfeed and generates an IFB backfeed in return. This is intended for an external studio source for which you wish to create a talkback channel.

• Record Mode – Provides GPIO control of the various Record button functions

• External Timer Control – Provides GPIO control of the count-up timer.

• V-Mixer – Controls the Vmixer “On” states.

• Show Profile – Allows GPIO control and status of Show Profiles.

Input, Output, and Pin Numbers

The following tables show pin numbers as they would appear on a Telos Alliance xNode with 15-pin GPIO ports. Common pins that are not profile-specific are as follows and are not listed in the individual tables:

• Pin 7 – GPO Common pin, typically tied to GND by application

• Pin 8 – GPIO port GND

• Pin 9 – 5vDC supply

• Pin 10 – GPI common pin, typically tied to 5vDC by application

Line Profile GPIO Table

Inputs (GPI)

ID	Name	Pin	Notes
GPI 1	ON Command	11	Momentary turns ON console channel and triggers START pulse
GPI 2	OFF Command	12	Momentary turns OFF console channel and triggers STOP pulse
GPI 3	PREVIEW Command	13	Active = PREVIEW ON Not Active = PREVIEW OFF
GPI 4	RESET Command	14	Momentary turns OFF channel w/o generating a GPO STOP pulse
GPI 5	READY Command	15	Latch to indicated READY (OFF button illuminated) for profiles defined with the READY enable

Outputs (GPO)

ID	Name	Pin	Notes
GPO 1	ON lamp	1	Latching during ON state
GPO 2	OFF lamp	2	Latching during OFF state and READY command if enabled
GPO 3	PREVIEW lamp	3	Latching during PREVIEW state
GPO 4	START pulse	4	Momentary at transition to ON
GPO 5	STOP pulse	5	Momentary at transition to OFF

Computer Player Profile GPIO Table

Inputs (GPI)

ID	Name	Pin	Notes
GPI 1	ON Command	11	Momentary turns ON console channel and triggers START pulse
GPI 2	OFF Command	12	Momentary turns OFF console channel and triggers STOP pulse
GPI 3	PREVIEW Command	13	Active = PREVIEW ON Not Active = PREVIEW OFF
GPI 4	Not used	14
GPI 5	READY Command	15	Latch to indicated READY (OFF button illuminated) for profiles defined with the READY enable

Outputs (GPO)

ID	Name	Pin	Notes
GPO 1	NEXT pulse	1	Momentary when ON button pressed and already in the ON state
GPO 2	OFF lamp	2	Latching during OFF state and READY command if enabled
GPO 3	PREVIEW lamp	3	Latching during PREVIEW state
GPO 4	START pulse	4	Momentary at transition to ON
GPO 5	STOP pulse	5	Momentary at transition to OFF

Phone Profile GPIO Table

Inputs (GPI)

ID	Name	Pin	Notes
GPI 1	ON Command	11	Momentary turns ON console channel and triggers START pulse if ON is configured to answer hybrid
GPI 2	OFF Command	12	Momentary turns OFF console channel and triggers STOP pulse if ON is configured to answer hybrid
GPI 3	PREVIEW Command	13	Active = PREVIEW ON Not Active = PREVIEW OFF
GPI 4	Not used	14
GPI 5	READY Command	15	Latch to indicated READY (OFF button illuminated) for profiles defined with the READY enable. Can be used to provide ring indication.

Outputs (GPO)

ID	Name	Pin	Notes
GPO 1	ON lamp	1	Latching during ON state
GPO 2	OFF lamp	2	Latching during OFF state and READY command if enabled
GPO 3	PREVIEW lamp	3	Latching during PREVIEW state
GPO 4	START pulse	4	Momentary to seize line based on hybrid control configuration
GPO 5	STOP pulse	5	Momentary to release line based on hybrid control configuration

Codec Profile GPIO Table

Inputs (GPI)

ID	Name	Pin	Notes
GPI 1	ON Command	11	Momentary turns ON console channel
GPI 2	OFF Command	12	Momentary turns OFF console channel
GPI 3	PREVIEW Command	13	Active = Routes channel audio to Preview and mutes channel
GPI 4	Not used	14	Mutes console channel
GPI 5	READY Command	15	Active = Initiates Talkback to Source from Operator Mic or Ext Talk

Outputs (GPO)

ID	Name	Pin	Notes
GPO 1	ON lamp	1	Latching during ON state
GPO 2	OFF lamp	2	Latching during OFF state and READY command if enabled
GPO 3	TALK TO CR lamp	3	Latching during active TALK TO CR state
GPO 4	MUTE lamp	4	Latching during active MUTE state
GPO 5	TALKBACK lamp	5	Latching during an active TALKBACK

Operator Microphone Profile GPIO Table

Inputs (GPI)

ID	Name	Pin	Notes
GPI 1	ON Command	11	Momentary turns ON console channel
GPI 2	OFF Command	12	Momentary turns OFF console
GPI 3	TALK TO STUDIO Command	13	Active = TALK TO STUDIO and will MUTE channel
GPI 4	MUTE command	14	Mutes channel console
GPI 5	TALK to source in Preview Command	15	Active = Initiates Talkback to channels that are in PREVIEW from Operator Mic and will MUTE channel

Outputs (GPO)

ID	Name	Pin	Notes
GPO 1	ON lamp	1	Latching during ON state unless TALK or MUTE are active
GPO 2	OFF lamp	2	Latching during OFF state
GPO 3	TALK TO STUDIO lamp	3	Latching during active TALK TO STUDIO state
GPO 4	MUTE lamp	4	Latching during active MUTE state
GPO 5	TALK to source in Preview lamp	5	Latching during an active TALK

CR Producer Microphone Profile GPIO Table

Inputs (GPI)

ID	Name	Pin	Notes
GPI 1	ON Command	11	Momentary turns ON console channel
GPI 2	OFF Command	12	Momentary turns OFF console
GPI 3	TALK TO STUDIO Command	13	Active = TALK TO STUDIO and will MUTE channel
GPI 4	MUTE command	14	Mutes channel console
GPI 5	TALK to source in Preview Command	15	Active = Initiates Talkback to channels that are in PREVIEW from Producer Mic and will MUTE channel

Outputs (GPO)

ID	Name	Pin	Notes
GPO 1	ON lamp	1	Latching during ON state unless TALK or MUTE are active
GPO 2	OFF lamp	2	Latching during OFF state
GPO 3	TALK TO STUDIO lamp	3	Latching during active TALK TO STUDIO state
GPO 4	MUTE lamp	4	Latching during active MUTE state
GPO 5	TALK to source in Preview lamp	5	Latching during an active TALK

CR Guest Microphone Profile GPIO Table

Inputs (GPI)

ID	Name	Pin	Notes
GPI 1	ON Command	11	Momentary turns ON console channel
GPI 2	OFF Command	12	Momentary turns OFF console
GPI 3	TALK TO CR Command	13	Active = TALK TO CR (Preview channel) and will MUTE channel
GPI 4	MUTE command	14	Mutes channel console
GPI 5	Not used	15

Outputs (GPO)

ID	Name	Pin	Notes
GPO 1	ON lamp	1	Latching during ON state unless TALK or MUTE are active
GPO 2	OFF lamp	2	Latching during OFF state
GPO 3	TALK TO CR lamp	3	Latching during active TALK TO CR state
GPO 4	MUTE lamp	4	Latching during active MUTE state
GPO 5	Not used	5

Studio Guest Microphone Profile GPIO Table

Inputs (GPI)

ID	Name	Pin	Notes
GPI 1	ON Command	11	Momentary turns ON console channel
GPI 2	OFF Command	12	Momentary turns OFF console
GPI 3	TALK TO CR Command	13	Active = TALK TO CR (Preview channel) and will MUTE channel
GPI 4	MUTE command	14	Mutes channel console
GPI 5	Not used	15

Outputs (GPO)

ID	Name	Pin	Notes
GPO 1	ON lamp	1	Latching during ON state unless TALK or MUTE are active
GPO 2	OFF lamp	2	Latching during OFF state
GPO 3	TALK TO CR lamp	3	Latching during active TALK TO CR state
GPO 4	MUTE lamp	4	Latching during active MUTE state
GPO 5	Not used	5

External Microphone Profile GPIO Table

Inputs (GPI)

ID	Name	Pin	Notes
GPI 1	ON Command	11	Momentary turns ON console channel
GPI 2	OFF Command	12	Momentary turns OFF console
GPI 3	TALK TO CR Command	13	Active = TALK TO CR (Preview channel) and will MUTE channel
GPI 4	MUTE command	14	Mutes channel console
GPI 5	Not used	15

Outputs (GPO)

ID	Name	Pin	Notes
GPO 1	ON lamp	1	Latching during ON state unless TALK or MUTE are active
GPO 2	OFF lamp	2	Latching during OFF state
GPO 3	TALK TO CR lamp	3	Latching during active TALK TO CR state
GPO 4	MUTE lamp	4	Latching during active MUTE state
GPO 5	Not used	5

Studio Feed Profile GPIO Table

Inputs (GPI)

ID	Name	Pin	Notes
GPI 1	ON Command	11	Momentary turns ON console channel
GPI 2	OFF Command	12	Momentary turns OFF console
GPI 3	TALK TO CR Command	13	Active = TALK TO CR (Preview channel) and will MUTE channel
GPI 4	MUTE command	14	Mutes channel console
GPI 5	Not used	15

Outputs (GPO)

ID	Name	Pin	Notes
GPO 1	ON lamp	1	Latching during ON state unless TALK or MUTE are active
GPO 2	OFF lamp	2	Latching during OFF state
GPO 3	TALK TO CR lamp	3	Latching during active TALK TO CR state
GPO 4	MUTE lamp	4	Latching during active MUTE state
GPO 5	Not used	5

Control Room Profile GPIO Table

Inputs (GPI)

ID	Name	Pin	Notes
GPI 1	MUTE CR Command	11	Mutes Preview and Monitors when active
GPI 2	DIM Command	12	Dims Monitors when active
GPI 3	EXT Preview Command	13	Routes External Preview defined in Show Profile to Preview
GPI 4	TALK TO EXT Command	14	Route Operator Mic or Ext Talk source as defined in Show Profile to Talk to External output
GPI 5	Not used	15

Outputs (GPO)

ID	Name	Pin	Notes
GPO 1	MUTE lamp, ON AIR lamp	1	Latching during Studio MUTE state
GPO 2	DIM lamp	2	Latching during DIM state
GPO 3	START/RESET lamp	3	Momentary indication of Timer change state
GPO 4	Not used	4
GPO 5	TALK TO STUDIO lamp	5	Latching during an active TALK TO STUDIO

Record (Enable) Mode Profile GPIO Table

Inputs (GPI)

ID	Name	Pin	Notes
GPI 1	Not used	11
GPI 2	Not used	12
GPI 3	Not used	13
GPI 4	Not used	14
GPI 5	Not used	15

Outputs (GPO)

ID	Name	Pin	Notes
GPO 1	RECORD ACTIVE lamp	1	Latching while in Record mode
GPO 2	RECORD NOT ACTIVE	2	Latching while Record mode is off
GPO 3	Not used	3
GPO 4	RECORD pulse	4	Momentary when entering Record mode
GPO 5	STOP pulse	5	Momentary when exiting Record mode

External Timer Control Profile GPIO Table

Inputs (GPI)

ID	Name	Pin	Notes
GPI 1	START command	11	Momentary starts timer
GPI 2	STOP command	12	Momentary stops timer
GPI 3	RESET command	13	Momentary resets timer
GPI 4	FREEZE command	14	Latching freezes timer view
GPI 5	Not used	15

Outputs (GPO)

ID	Name	Pin	Notes
GPO 1	START lamp	1	Momentary at timer start
GPO 2	STOP lamp	2	Momentary at timer stop
GPO 3	RESET lamp	3	Momentary at timer reset
GPO 4	FREEZE lamp	4	Active during freeze state
GPO 5	Not used	5

V-Mixer Profile GPIO Table

Inputs (GPI)

ID	Name	Pin	Notes
GPI 1	In 1 ON command	11	Normal: Latch to turn ON Toggle: Momentary for ON/OFF Radio: Last momentary is ON, all others OFF
GPI 2	In 2 ON command	12
GPI 3	In 3 ON command	13
GPI 4	In 4 ON command	14
GPI 5	In 5 ON command	15

Outputs (GPO)

ID	Name	Pin	Notes
GPO 1	In 1 ON lamp	1	Active when ON
GPO 2	In 2 ON lamp	2	Active when ON
GPO 3	In 3 ON lamp	3	Active when ON
GPO 4	In 4 ON lamp	4	Active when ON
GPO 5	In 5 ON lamp	5	Active when ON

Show Profile GPIO Table

Inputs (GPI)

ID	Name	Pin	Notes
GPI 1	None command	11	Changes to blank profile
GPI 2	Profile A command	12	Changes to A profile
GPI 3	Profile B command	13	Changes to B profile
GPI 4	Profile C command	14	Changes to C profile
GPI 5	Profile D command	15	Changes to D profile

Outputs (GPO)

ID	Name	Pin	Notes
GPO 1	Profile None lamp	1	Active when NONE
GPO 2	Profile A lamp	2	Active when Profile A
GPO 3	Profile B lamp	3	Active when Profile B
GPO 4	Profile C lamp	4	Active when Profile C
GPO 5	Profile D lamp	5	Active when Profile D