RP4.2-HY12 - Car audio interface PAC - Free user manual and instructions

Product Type	Programmable Control Module
Model	RP4.2-HY12
Brand	PAC
Dimensions (W x H x D)	120 mm x 80 mm x 30 mm
Weight	200 g
Power Supply	12V DC, 2A
Power Consumption	10 W max
Operating Temperature	0°C to 50°C
Storage Temperature	-20°C to 70°C
Humidity Range	10% to 90% non-condensing
Input/Output Ports	4 digital inputs, 2 relay outputs, 1 RS485 port
Communication Protocol	Modbus RTU
Programming Interface	USB-C for configuration
Enclosure Material	ABS plastic, IP20 rating
Mounting	DIN rail mountable
Functions	Logic control, timing, counting, data logging
Maintenance	Clean with dry cloth; avoid liquids
Safety	Use only specified power supply; do not disassemble
Spare Parts & Repairability	Contact PAC support for replacement units; no user-serviceable parts
Warranty	2 years from date of purchase

Frequently Asked Questions - RP4.2-HY12 PAC

How do I power the RP4.2-HY12?

Connect a 12V DC power supply with at least 2A current rating to the power input terminal. Ensure proper polarity.

Can I use this module outdoors?

No, the device is rated IP20 and is intended for indoor use only, in a clean and dry environment.

How do I program the module?

Use the PAC Configuration Software (available on our website) and connect via USB-C. Follow the user manual for programming steps.

What is the maximum load for the relay outputs?

Each relay output can handle up to 5A at 30V DC or 250V AC for resistive loads.

Does the module support Modbus?

Yes, it supports Modbus RTU over RS485. Baud rate and other settings can be configured via software.

How do I mount the RP4.2-HY12?

The module is designed for DIN rail mounting. Simply clip it onto a 35mm DIN rail.

Can I connect sensors to the digital inputs?

Yes, the digital inputs accept dry contacts or NPN sensors. Refer to the wiring diagram in the manual.

What should I do if the device does not power on?

Check the power supply voltage and connections. Ensure the power supply is functioning. If the problem persists, contact support.

Is the device firmware upgradeable?

Yes, firmware updates can be applied via the USB-C port using the PAC Configuration Software.

How do I clean the module?

Use a soft, dry cloth to remove dust. Do not use water, solvents, or abrasive cleaners.

USER MANUAL RP4.2-HY12 PAC

Introduction & Features

The RP4.2-HY12 interface allows the replacement of a factory radio in the Hyundai Veloster. Using this interface will retain factory features such as: steering wheel controls (SWC), secondary screens, reverse camera and factory SPDIF audio amplifier (separate part required, part # RPA-SPDIF) whenever the original radio is removed. Use of this interface also allows you to program two radio functions to each SWC button by using short press long press dual command functionality. The RP4.2-HY12 also provides data bus driven outputs such as vehicle speed sense (VSS), illumination, reverse trigger and parking brake.

Important Notes

1. These instructions apply to R.01.0.17 or later revisions. The revision info can be found on a small white sticker on the interface and packaging.
2. Does not retain Blue Link.
3. The AUX connection in the RP4 harness will only provide sound if the aftermarket radio has a USB port. This is because the USB port provides the power to make the factory USB / AUX port work. If you have connected the USB plug to your aftermarket radio and it is still inoperable, this means that the aftermarket radio's USB port is not supplying enough current.
4. When using the RPA-SPDIF in factory amplified vehicles, you can adjust factory amplifier settings such as Bass, Mid, Treble, Fader, Balance and Gain with the RadioPRO app found at www.pac-audio.com. Please refer to page 6 for detailed instructions on the app and the functionality of the Red / White wire.
5. In vehicles equipped with auto climate controls, you will lose the fan mode, fan speed, auto status and temperature display.

Wiring Connection Chart

Interface Connector 1

Red	Accessory Output (10 amp)
Yellow	12v+
Black	Ground
Red	Accessory Output

Interface Connector 2

3.5mm Jack SWC Output
Pink MS-CAN + Input
Pink/Black MS-CAN - Input
Blue/Yellow SWC Output
Red/White 12v+ Programmable Output (1 amp)
Orange/White Illumination Output
Pink Vehicle SpeedSense Output
Violet/White Reverse Output
White/Black HS-CAN + Input
White/Red HS-CAN - Input
White Analog SWC
Orange/Black	Illumination Input
Light Green	Parking Brake Output (-)
Blue/White	Amp Turn On Input

Vehicle Connector

Yellow	Battery +12v
Black	Ground
Blue	Power AntennaTurn On Input
White	Front L + input
White / Black	Front L - input
Grey	Front R + input
Grey / Black	Front R - input
Green	Rear L + input
Green / Black	Rear L - input
Purple	Rear R + input
Purple / Black R	Rear R - input
Yellow RCA	Factory ReverseCamera Video (if equipped)

Module Layout

Installation Steps

1234

DIP ON↓

SET RADIO DIPSWITCHES TO THE ON POSITION

Alpine JV	C Kenwood Cl	arion Pioneer	/Other Sony Fusion
1	2	1 & 2	3	1, 2, & 3	4

1. The radio select dipswitches on the side of the interface must be adjusted to the proper radio setting before plugging the interface into the vehicle.
2. Make all connections as described in the connection chart on page 1. Vehicles without a factory amplifier: Connect the aftermarket radio's front and rear speaker wires to the vehicle connector. Vehicles with a factory amplifier: Connect the aftermarket radio's front speaker wires to the SPDIF converter (sold separately, part # RPA-SPDIF), then connect the SPDIF converter to the 6-pin connector located on the RP4.2 harness.
3. Connect the SWC wire to the aftermarket radio (aftermarket radio must support a wired remote input).
4. Once all connections have been made, plug the interface into the vehicle.
5. If you wish to reassign functions to the SWC, utilize short press long press dual command functionality or assign the programmable 12v output to a SWC button, follow the optional programming instructions on the next page.

Steering Wheel Controls

Default Steering Wheel Control Programming

IMPORTANT! The interface comes pre-programmed for all of the vehicles factory SWC functions and does not require programming unless you wish to re-assign the SWC functions, utilize short press long press dual command functionality or assign the programmable 12v output to a SWC button. The SWC can always be restored to default settings by pressing and releasing the program button on the side of the interface once and waiting 7 seconds for the LED to flash 3 times.

Steering Wheel Controls (cont.)

Default SWC Button Assignments

	Alpine	JVC Kenwood	Clarion	Pioneer	r	Sony	Fusion
Volume +	Volume +	Volume +	Volume +	Volume +	Volume +	Volume +	Volume +
Volume -	Volume -	Volume -	Volume -	Volume -	Volume -	Volume -	Volume -
Source	Source	Source	Source	Source	Source	Source	Source
Track +	Track +	Track +	Track +	Search +	Track +	Track +	Track +
Track -	Track -	Track -	Track -	Search -	Track -	Track -	Track -
Voice	Voice	Voice	Voice	Voice	Voice	Voice	Mute
Mute	Mute	Mute	Att	Mute	Mute	Mute	N/P
Phone Answer	Receive	Receive	Answer	Send	Mute	Answer/End	Audio
Phone End	End	Reject	Voice	End	End	Reject/Source	Power

Optional Steering Wheel Control Programming

If you wish to re-assign the SWC functions, utilize short press long press dual command functionality or assign the programmable 12v output to a SWC button, the interface must be programmed in the specific order shown in the chart on page 4. If you come across a function in the chart that your steering wheel does not have, or you do not want to program, press and release the programming button on the side of the interface to skip that function. The LED will flash off and on confirming that you have successfully skipped that function and are ready to proceed to the next one.

Short Press Long Press Dual Command Functionality

This feature allows you to assign two aftermarket radio functions to each of the vehicles SWC buttons. It can be used with as many of the buttons as the user likes or none at all. When this functionality is implemented, quickly pressing and releasing a SWC button will initiate the short press command while pressing and holding a SWC button for longer than two seconds will initiate the long press command. Please note that no long press commands are programmed by default. If you wish to assign dual command functionality to the SWC please follow the programming steps on the next page.

Programmable 12v Output

The red/white wire on the interface can be programmed via the RadioPRO app to do a pulsed or latched 12v output which can then be assigned to any of the vehicle's factory SWC buttons. When assigned, the factory SWC button will activate the pulsed or latched output to control external accessories. Please refer to page 6 for more details on how to use the app to set this feature.

SET RADIO DIPSWITCHES TO THE ON POSITION

Alpine JV	C Kenwood Clarion Pioneer/Other Sony Fusion
1 2 1 &	2 3 1, 2, & 3	4	1 & 4

Steering Wheel Controls (cont.)

Optional SWC Programming Procedure

1. Turn the key to the ignition position.
2. Press and release programming button on the side of the interface. The Status LED will turn green.
3. Within 7 seconds, press the button that is to be learned on the steering wheel. The LED will turn red when the button is pressed. At this point you have two options:

A. For short press functionality: Release the button within 1.5 seconds. The LED will turn back on.
B. For long press functionality: Hold the button until the LED starts blinking. Release the button and the LED will go back to solid.

1. If you need to program more buttons, repeat step 3 for each additional audio function on the steering wheel.

2. If you come across a function in the chart that your steering wheel does not have, or you do not want to program, press and release the program button on the side of the interface to skip that function.

3. Once programming is completed, wait seven seconds. The LED will flash three times indicating end of programming.

4. Test the interface for proper functionality. Whenever a SWC is pressed the LED on the interface should blink. If any function does not work, repeat the programming steps.

Optional Programming Order

	Alpine JVC Henwood Clarion Other * Pioneer Sony Fusion
1 Volume + Volume + Volume + Volume + Volume + Volume + Volume +
2	Volume -	Volume -	Volume -	Volume -	Volume -	Volume -	Volume -	Volume -
3	Mute	Mute	ATT	Mute	Mute	Mute	Mute	Mute
4	Preset +	Source	Source	Source	Preset +	Preset +	Preset +	Source
5	Preset -	Track +	Play	Search +	Preset -	Preset -	Preset -	Track +
6	Source	Track -	Track +	Search -	Source	Source	Source / End Call	Track -
7	Track +	Band / Disc +	Track -	Band	Track +	Track +	Track +	Audio
8	Track -	Preset / Disc -	Disc / FM +	Send / End	Track -	Track -	Track -	Power
9	Power	Select	Disc / AM -	Send	Band	Band	Band
10	Enter / Play	Attenuation	Answer	End	Answer **	Phone Menu	Power / End Call
11	Band / Program	Phone Receive	Voice	Voice	End** Answer Call Voice / Answer / End Call
			12	hong@ One	*PT | C#E		Voice (Android Auto & Car Play)Answer / End Call ***
13	Ed	Voice	o#F			Voice
14	Voice	Power	Mute
15			et#P
* Advent, Boyo, Dual, Lightning Audio, Jensen, Rockford Fosgate & Visteon ** Jensen & Advent ONLY *** XAV-AX100 Only

Steering Wheel Control Re-Calibration

SWC re-calibration is necessary when the SWC operation in vehicles with analog SWC is erratic or non-existent. This process re-calibrates the SWC values to the RP4 interface so it will know what they can be set to for button function assignment. The interface must be programmed in the specific order shown in the chart on the next page. If you come across a function in the chart that your steering wheel does not have you must press and release the program button on the side of the interface to skip that function. The LED will flash off and on confirming that you have successfully skipped that function and are ready to proceed to the next one.

The SWC and radio command assignments can always be restored to default values by entering re-calibration mode (Steps 1-2) and not pressing any buttons. After 7 seconds the re-calibration mode will time out and all default values will be restored.

Steering Wheel Controls (cont.)

SWC Re-Calibration Procedure

1. Turn the key to the ignition position.
2. Press and hold the programming button until the LED begins blinking amber. When the LED begins blinking, release the programming button. The LED will light solid amber. PLEASE NOTE: If the vehicle has CAN-Bus SWC the LED will never blink amber and will go directly to blinking red.
3. Within 7 seconds, press and hold the button that is to be learned on the steering wheel. The LED will turn off when the button is pressed and begin blinking when the value has been learned. Once the LED begins blinking, release the button.
4. If you need to program more buttons, repeat step 3 for each additional audio function on the steering wheel.
5. If you come across a function in the chart that your steering wheel does not have, press and release the program button on the side of the interface to skip that function.
6. Once programming is completed, wait seven seconds. The LED will flash indicating end of programming.
7. Test the interface for proper functionality. Whenever a SWC is pressed the LED on the interface should blink. If any function does not work, repeat the programming steps.

Button Programming Order

Volume Up

Volume Down

Track Up

Track Down

Mode

Mute

Voice

End Call

Answer Call

Power

After you have re-calibrated the SWC buttons, the default SWC button assignments will be the same as what is listed in the chart on page 3. If you wish to re-assign button functions you must also go through the programming process on page 4.

Testing & Verification

1. Turn the ignition on. The LED on the interface will turn on & the +12v accessory wire will turn on.
2. Turn on the radio & check balance & fade. Note: Factory amplified Systems must use the Radio PRO App to adjust amplifier settings. Verify that the factory subwoofer (if present) is playing.
3. Verify that all SWC are functioning properly.
4. Verify that the programmable 12v+ output is functioning as intended.
5. The LED & radio will turn off when the ignition is turned off.

Restoring Factory Settings

You can restore the interface to factory default settings by pressing and holding the programming button on the side of the module until the status LED starts blinking red. Once the LED starts blinking red, release the button. You must release the button while the LED is blinking red in order to perform the reset.

This reset will restore the following settings to their factory defaults:

• SWC Mapping
• SWC Calibration
  • Programmable 12v+ Output (Latched)
  • Factory Amplifier Settings

RadioPRO App

Use of the RadioPRO App in Hyundai allows you to do the following:

• Configure User Interface Options such as:
  • Red/White wire output behavior
  Factory amplifier settings (Bass, Mid, Treble, Gain, Fader & Balance)
• Update Product Firmware
• Read Firmware/Hardware Versions
• Access Product User Manuals

Programmable Red/White Wire

The red/white wire can be programmed to do a pulsed or latched trigger that is controlled by a user assigned steering wheel control button. Select User Interface Options then set the behavior of the red/white wire using the drop down menu. PLEASE NOTE: Available triggers depend on what info is available on the vehicles data bus. Restoring factory settings on the module will default this wires output back to a latched SWC trigger.

Latched - This selection will provide a latched 12v+ output that can be tied to any of the vehicles SWC. This means that when you press the assigned SWC, the red/white wire will turn on and remain on until the assigned SWC is pressed again or the ignition is turned off.

Pulsed - This selection will provide a user programmable timed 12v+ output that can be tied to any of the vehicles SWC. This means that when you press the assigned SWC, the red/white wire will pulse for the pre-programmed user time. The range for pulse time is 100 milliseconds - 25.5 seconds (.1-25.5).

Factory Amplifier Settings

The RadioPRO app will also allow you to adjust the settings of the factory amplifier. You can adjust Amp Gain, Fader, Balance, Bass, Mid & Treble. Restoring factory settings on the module will default all values back to middle.

Firmware Updates

The RadioPRO app will also allow you to update the interface with new firmware as it becomes available. Please visit www.pac-audio.com or contact our tech support department to see if there is a firmware update for your interface.