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The modules TEI0015, TEI0016 and TEI0016 implements TEI0023 implement a handler for executing commands. The serial interface speed
must be set to 115200 bits, commands consists of a single  single character in UTF-8 encoding.
Each command must be transmitted individually.
These commands apply .

All commands are identical for all tree modules, except commands for setting the gain.

The modules TEI0015 and TEI0016 recognized the following gain commands since module revision 02.:

"1"   Sets the pre-amplification of the ADC's input to 1

"2"    Sets the pre-amplification of the ADC's input to 2

"4"    Sets the pre-amplification of the ADC's input to 4

"8"    Sets the pre-amplification of the ADC's input to 8

The module TEI0023 recognized the following gain commands:

"0" Deactivates the pre-amplifier

"1" Sets the pre-amplification of the ADC's input to 0.25

"2" Sets the pre-amplification of the ADC's input to 0.5

"3" Sets the pre-amplification of the ADC's input to 1

"4" Sets the pre-amplification of the ADC's input to 2

"5" Sets the pre-amplification of the ADC's input to 4

"6" Sets the pre-amplification of the ADC's input to 8

"8" Sets the pre-amplification of the ADC's input to 16

"t"    The ADC measures 1 mega samples and saves the values into its SD-RAM

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"?"   The module returns its ID:
               TEI0015 with ADC AD4003 / 2 MSps returns "1"
               TEI0016 with ADC ADAQ7988 / 0.5 MSps returns "2"
               TEI0016 with ADC ADAQ7980 / 1 MSps returns "3"
               TEI0023A with ADC AD4003 / 2 MSps returns "4"

"F"   The module activates a square wave signal,
        frequency = 10 kHz and  amplitude is +3,3 V / ground
        the signal is accessible on the pads
               - D5 in normal mode and
               - D6 in time inverted mode

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