The EPD-37A is a relay terminal block for connecting the signal of external equipment to the 37-pin D-SUB connector [F (female) type ] of our interface board. The connectors and terminal blocks are 1 to 1, making it easy to connect the board/card to external devices through the terminal block. Can be used with both round and Y-shaped terminals. Note: For connecting the board/card to this product, you will need an optional cable (sold separately).