StopBits

Specify number of bits used to indicate end of byte

Description

You can configure StopBits to be 1, 1.5, or 2 for serial port objects, or 1 or 2 for VISA-serial objects If StopBits is 1, one stop bit is used to indicate the end of data transmission. If StopBits is 2, two stop bits are used to indicate the end of data transmission. If StopBits is 1.5, the stop bit is transferred for 150% of the normal time used to transfer one bit.

Note

Both the computer and the instrument must be configured to transmit the same number of stop bits.

In addition to the stop bits, the serial data format consists of a start bit, between five and eight data bits, and possibly a parity bit. You specify the number of data bits with the DataBits property, and the type of parity checking with the Parity property.

Characteristics

Usage	Serial port, VISA-serial
Read only	Never
Data type	double

Values

Default value is enclosed in braces ({}).

Serial Port

{1}	One stop bit is transmitted to indicate the end of a byte.
1.5	The stop bit is transferred for 150% of the normal time used to transfer one bit.
2	Two stop bits are transmitted to indicate the end of a byte.

VISA-Serial

{1}	One stop bit is transmitted to indicate the end of a byte.
2	Two stop bits are transmitted to indicate the end of a byte

Examples

This example shows how to set the StopBits for a serial port object.

Create a serial port object associated with the COM1 port. The default setting for StopBits is 1 for serial port objects. Change the value to use two stop bits to indicate the end of data transmission.

s = serial('COM1');
s.StopBits = 2;