Texas Instruments ADS1254, Руководство пользователя

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Host PC Software
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Figure 3−2. Setup Dialog
3.5.3.1 Serial Port Menu
The serial port menu allows you to choose which serial port to use for
communication with the ADS1254EVM. The ADS1254EVM must be
connected to the port selected here, or the program will not work.
All of the available ports are shown in the menu. If you know that a port exists,
but you do not see it in the menu, it usually means that the port is being used
by another program.
3.5.3.2 Channel to Acquire
The ADS1254EVM can read any of four differential channels. Use the channel
to acquire buttons to select which channel to read when performing an
acquisition.
By default, this is set to CH1 (channel 1).
3.5.3.3 Reference Voltage
Here you can tell the program what reference voltage you are using. This value
is used in certain display calculations. You must input the correct reference
voltage here, because the board cannot detect the reference voltage, so the
software has no way to obtain the information automatically.
Changing the reference voltage here does not affect the operation of the
board; it only changes the reference voltage value used by the program in
certain calculations. If the reference voltage selected here is incorrect, some
values shown by the program will be incorrect, but the program and board
operate normally otherwise.