Suits a relay, opto-isolated interface or supported serial adapter that presents a hardware sense-line state such as CTS.
| Control | Guidance |
|---|---|
| Port | Select the serial interface that exposes the required hardware sense line. |
| Sense line | Choose the input used by the interface, such as CTS. Available choices depend on the serial hardware and driver. |
| Invert | Reverse the active state when the external hardware reports open and closed in the opposite way to the desired recording state. |
| Run-on | Continues recording briefly after the sense line returns to its inactive state. |
Basic Arduino example
Connect the Arduino to a suitable relay or opto-isolated module. Use the module's dry contact only with a serial-contact interface that is documented to accept a closure on its sense input. The sketch below closes the relay while a button on pin 2 is pressed.
const int buttonPin = 2;
const int relayPin = 8;
void setup() {
pinMode(buttonPin, INPUT_PULLUP);
pinMode(relayPin, OUTPUT);
digitalWrite(relayPin, LOW);
}
void loop() {
bool active = (digitalRead(buttonPin) == LOW);
digitalWrite(relayPin, active ? HIGH : LOW);
delay(20);
}Wire the relay contacts to the supported serial-contact interface according to its documentation, then select the corresponding COM port and sense line in BroadcastLogger. Use Invert when the resulting active state is reversed.
ELECTRICAL SAFETY: Do not connect an Arduino GPIO pin directly to a conventional RS-232 connector or handshake pin. RS-232 voltage levels and polarity differ from 3.3 V or 5 V logic. Use an appropriate isolated relay, optocoupler, level converter or purpose-built contact interface.