by Colin Chidgey G3YHV
RS232 is a standard protocol used for serial communication, it is used for connecting computer and its peripheral devices to allow serial data exchange between them. The Serial port tester program is used to test PTT and CW KEYING When using the DRT and RTS lines of the computer serial port.
The program Takes these lines from the normally low to the high state for 10 seconds.
If you build a simple transistor interface for keying the transmitter be aware that the low state of the RS232 port is MINUS 12 volts, the High state is PLUS 12 volts. On a laptop it is sometimes only 8 volts.
THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Note: On Windows 10 you will get a warning whilst attempting to install this software which can be safely ignored.