JMRI: Speedometer - Using the serial port for block sensors

# Speedometer

## Using the serial port for Block Sensors

Jim Scorse has provided a schematic for connecting an NCE block detector to the serial port.

### DB9 and DB25 connections

           DB9 pin      DB25 pin
           -------      --------

    DCD      1             8
    RxD      2             3
    TxD      3             2
    DTR      4            20
    ground   5             7
    DSR      6             6
    RTS      7             4
    CTS      8             5
    RI       9            22

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