Bluetooth - PS/2 Connection

We connected our EmbeddedBlue EB500 Bluetooth Transceiver via one of the Parallax Propeller's built-in PS/2 ports.  The male connector was re-purposed from an old keyboard; the wire ends of the cord are soldered to a 2 x 10 male x female header (0.1" spacing).  The wiring diagram is below:

 

We elected to connect to the green PS/2 port labeled "Keyboard," communicating on the Propeller's digital pins 24 and 25.  The actual signal connections are shown in the table below:

      PS/2 Pin  Signal  EB500 Pin

      ---------------------------

         1      TX           3

         2      N/C          -

         3      GND      1 & 2

         4      VCC         20

         5      RX           4

         6      N/C          -

The TX connection is data transmitted from the EB500; RX is the data line incoming from the Propeller.  N/C = no connection.  Note that the EB500 data sheet specifies that both pins 1 and 2 be connected to ground; we have accomplished that by soldering them together on the header.  That way we weren't risking any damage to our (now out of production) Bluetooth board.