Parallel port pinouts.
You can use NuMorse Pro to drive a code oscillator or a transmitter via a hardware port. You can either add an extra port as an ISA or PCI card or use the existing printer port on your system. Here are the data pinout details for a Centronics parallel printer port, this view is looking into the rear of the PC.
Pin |
Signal |
2 |
Bit 0 |
3 |
Bit 1 |
4 |
Bit 2 |
5 |
Bit 3 |
6 |
Bit 4 |
7 |
Bit 5 |
8 |
Bit 6 |
9 |
Bit 7 |
33 |
GND |
Here is a circuit diagram of a simple code oscillator that has been tested with NuMorse Pro on the printer port (decimal 888) by the author:
Connect it to your PC between GND and any printer data pin. On a Centronics parallel printer port this would be between pin 33 and any other pin in the table above.
A more advanced circuit for a Relay Interface unit is shown here which drives a flashing mains lamp display. This could be used in a classroom situation for people learning visual signalling methods. Both of the circuits shown here can easily be adapted for serial or parallel port operation.
Serial port pinouts.
9-pin or 25-pin connectors are used for the serial ports on most PCs. If a serial connector is not provided on the PC then it may be possible to use a USB-serial interface unit. Pinout details for the RTS and DTR lines are shown below.
RS-232 - DB9 serial male connector
Pin Assignments for DB9 serial connector
1 DCD Data carrier (line signal) detect
2 RXD Receive data
3 TXD Transmitted data
4 DTR Data terminal ready
5 GND (Signal) ground
6 DSR Data set ready
7 RTS Ready/request to send
8 CTS Clear to send
9 RI Ring indicator
RS-232 - DB25 serial male connector
Pin Assignments for DB25 serial connector
1 Shield - chassis/frame protective ground
2 TXD Transmitted data
3 RXD Receive data
4 RTS Ready/request to send
5 CTS Clear to send
6 DSR Data set ready
7 GND (Signal) ground
8 DCD Data carrier (line signal) detect
9 Reserved for testing - positive voltage
10 Reserved for testing - negative voltage
11 Unassigned
12 SCF Secondary received carrier (line signal) detect
13 SCB Secondary clear to send
14 SBA Secondary transmitted data
15 DB Transmission signal element timing (clock)
16 SBB Secondary received data
17 DD Receiver signal element timing (clock)
18 Unassigned
19 SCA Secondary request to send
20 DTR Data terminal ready
21 CG Signal quality detector
22 RI Ring indicator
23 CH/CI Data signal rate selector
24 DA External transmit signal element timing (clock)
25 Test mode