# Send transmission format

When the Send element gains control, it sends the data through the send pin of its associated microcontroller. Make sure the Enable serial communications option is checked to display the send and receive pins.

Associated addresses of variable, digital port and analogue pins:

Type of transmitted data | Address
--- | ---
Variable | 1
Digital Port | 2
1st Analogue Pin | 3
2nd Analogue Pin | 4
3rd Analogue Pin | 5
4th Analogue Pin | 6

The data is sent in binary format in address-data pairs, with each address followed by its value. The least significant bit is usually sent first and each address or data byte starts with 0 and finishes with 1.

Select the Simulate full sequence option on the Send part's Properties pane to send every address-data pair, otherwise just the first pair will be sent.

The data is transmitted whether or not a Receive element is waiting to receive data.

## See also:

- Send