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17. L and R pins, AUXOUT (Line Out);
18. AUX1 IN, L and R channel pins. Input sensitivity 1 Vrms, impedance 10 KΩ (see chapter 6.2.5);
19. AUX2 IN, L and R channel pins. Input sensitivity 1 Vrms, impedance 10 KΩ (see Chapter 6.2.6);
20. IR pin. Carries the InfraRed signal received from the front receiver. Can be connected to an IR signal
distribution bus, like Vivaldi CA20/21 or CA28;
21. OC1 pin for Intercom calls control between multiple devices (Digital I/O, see Chapter 6.4.5);
22. OC2 pin (Digital I/O, see Chapter 6.4.5);
23. IL pin (Digital I/O). Command VIVALDI optional accessories and devices in combination with FREEmk3
and FREENETmk3 (see Chapter 6.4.5);
24. A and B pins for RS485 communication bus for connecting CA28L/+ main unit (FREENETmk3), iCONTROL
server (FREENETmk3), or FREECONTROL mini server and CA20/21 matrix (FREEmk3);
4.3 FREESOURCEMK3 REAR
13
18 19 20
25
21 23
22 24
14
16
15
17
13. + and – pins for power supply. Allowed power from 12 to 24 VDC;
14. + and – pins, balanced mono audio output;
15. + and – pins, balanced MIC input;
16. MIC pin. Connect in parallel between more devices in the system to use intercom functionality (see Chapter
6.2.8 and 6.2.9);
17. ANT pins. Connect the device to the centralized TV antenna system with a 75Ω impedance coaxial antenna
cable (see Chapter 6.2.2);
18. L and R pins, AUXOUT (Line Out);
19. AUX1 IN, L and R channel pins. Input sensitivity 1 Vrms, impedance 10 KΩ (see chapter 6.2.5);
20. AUX1 IN, L and R channel pins. Input sensitivity 1 Vrms, impedance 10 KΩ (see chapter 6.2.6);
21. IR pin. Carries the InfraRed signal received from the front receiver. Can be connected to an IR signal
distribution bus, like Vivaldi CA20/21 or CA28;
22. OC1 pin for Intercom calls control between multiple devices (Digital I/O, see Chapter 6.4.5);
23. OC2 pin (Digital I/O, see Chapter 6.4.5);
24. IL pin (Digital I/O). Command VIVALDI optional accessories and devices in combination with
FREESOURCEmk3 (see Chapter 6.4.5);
25. A and B pins for RS485 communication bus for connecting CA20/21 main unit or iCONTROL server;
