A. communicating via the serial control lines, Section, Or as analog voltage inputs for the slo-scope (see – Pololu USB AVR User Manual
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PuTTY is a free Windows terminal program that can send and receive bytes on a
serial port.
If you need to send and receive non-ASCII bytes, you can use the
.
You can also write a computer program to use the serial port. The freely available Microsoft .NET framework contains
a SerialPort class that makes it easy to read and write bytes from a serial port. Here is some example C# .NET code
that uses a serial port:
// Choose the port name and the baud rate.
System.IO.Ports.SerialPort port = new System.IO.Ports.SerialPort("COM4", 115200);
// Connect to the port.
port.Open();
// Transmit two bytes on the TX line: 1, 2
port.Write(new byte[]{1, 2}, 0, 2);
// Wait for a byte to be received on the RX line.
int response = port.ReadByte();
// Show the user what byte was received.
MessageBox.Show("Received byte: " + response);
// Disconnect from the port so that other programs can use it.
port.Close();
6.a. Communicating via the Serial Control Lines
Firmware version 1.04 (released on April 29th, 2011) fixes a problem with the RTS and DTR control signal
outputs. If you want to use those outputs, you should upgrade your firmware to version 1.04. Please see
for information about upgrading your firmware.
Firmware version 1.03 (released on December 22nd, 2010) inverts the TTL serial port’s control signals
so that 0 V corresponds to 1 and 5 V corresponds to 0, making it consistent with other USB-to-TTL-
serial adapters. Prior to version 1.03, the opposite convention was used.
In addition to transmitting bytes on the TX line and receiving bytes on the RX line, the USB-to-TTL-serial adapter
can use programmer pins A and B as serial handshaking lines of your choosing. Each pin can be configured as an
Pololu USB AVR Programmer User's Guide
© 2001–2014 Pololu Corporation
6. Communicating via the USB-to-TTL-Serial Adapter
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