Serial Console

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Recording time is not measured, but calculated from the number of samples collected. The speed is used

to determine the amount of time for each sample. If the data rate is changed at the board, the recording

time will be incorrect. This change does not affect the data file, except that samples continue to be

collected with the different settings.

In Recording mode, analysis proceeds as in Analysis mode; Recording mode is identical to Analysis

mode, except that data is written to a file. See the previous section for documentation on Analysis mode.

When Recording mode begins, if the selected file exists, it is erased and overwritten. The pre-existence of

the file is checked only when a new file is selected.

4.7.1

File Format

Data files begin with a header that contains the text collected from ADS1x31REF, the time of recording,

and the speed and gain. Following this header, values are written in either volts or raw codes, with one

value per line. Line separators are in DOS format, consisting of a carriage return and a line feed. This

format can be examined in a text editor and loaded or imported into most other software, including

spreadsheets.

Voltages are calculated using the reference voltage given in the Vref control; it is therefore important that

this value be correct.

5

Serial Console

The ADS1x31REF provides a console mode that can be used with any Windows terminal emulation

program, such as Hyperterm

™. In Windows, this configuration is done through the Virtual COM Port driver

supplied with the EVM software, causing the ADS1x31REF to appear in Windows as an extra serial port.

5.1

Using the Console

To use the console, load a terminal emulation program and connect to the EVM serial port using the

following parameters:

•

Baud rate: 115200

•

Data bits: 8

•

Parity: none

•

Stop bits: 1

•

Flow control: none

•

Local echo: off

•

Terminal emulation: ANSI or VT100

Setting up the terminal program is beyond the scope of this document; see the specific terminal program

documentation for details.

To locate the serial port, try higher port numbers first. When the board first starts, it outputs the following

message:

ADS1131REF 1.0.0 (c)2010 Texas Instruments

1131>

for the ADS1131, or :

ADS1231REF 1.0.0 (c)2010 Texas Instruments

1231>

for the ADS1231. Pressing Reset causes the board to output this message.

entered at this prompt. Commands consist of one letter possibly followed by arguments. The format of the

arguments depends on the command.

Commands are case insensitive. Upper-case characters are printed here, but lower-case characters also

work.

18

ADS1131REF and ADS1231REF

SBAU175A

– July 2010 – Revised August 2011

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