User's Manual

AMB2561_MA_V1_0 Page 4 of 11 Date: 03/2014
The detailed description of the configuration possibilities, operating modes,
commands, etc. can be found in the manual [1].
A “high” level on the DTR line holds the module in reset state.
Some terminal programs automatically set the DTR line to “high” when opening the
COM port, which prevents normal operation of the stick.
The signal level on the DTR line has to be set to “low”.
2 Using the USB-Stick with a terminal program
Since not all terminal programs offer the possibility to configure the DTR line, it has to be
mentioned that “Terminal.exe” is a program which does offer this necessary functionality. It can
be downloaded free of charge from [3].
2.1 Example Terminal.exe
The program can be started directly after haven been downloaded and extracted onto your PC,
without any further installation. In the upper left corner you can select the COM port (between
COM1 and COM20). If the stick is assigned to a higher port number by Windows, you may
follow the instructions under [4] to release COM ports that are not in use. Thereafter the
remaining settings can be selected (38400 Baud, 8n1, no handshaking), and the COM port may
be opened by clicking the “Connect” button. By clicking on the DTR LED (see red arrow) it is
possible to switch the DTR line to “high” or to “low” (LED is gray). With DTR set to “low” the stick
is now able to transmit the data which is entered in the “send” field at the bottom. The received
data is displayed in the “Receive” field above.