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    Diagram Rev 2

    Uploaded by

    Mohamad Yusuf

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    Diagram Rev 2

    Uploaded by

    Mohamad Yusuf
    32 views1 page

    Copyright

    © © All Rights Reserved

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    PDF, TXT or read online from Scribd

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    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    32 views1 page

    Diagram Rev 2

    Uploaded by

    Mohamad Yusuf

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
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    22 uF

    9 - 5 Volts NC 5 - REQ 3 - CLK 1 - GRD

    1 P1.0 VCC 40
    2 P1.1 P0.0 39
    3 P1.2 P0.1 38
    10 - GRD NC NC NC 2 - DATA 4 P1.3 P0.2 37

    Intel 8051/8751 8 Bit Microprocessor


    5 P1.4 P0.3 36
    Mitutoyo Display Input Pinout 6 P1.5 P0.4 35
    7 P1.6 P0.5 34
    10k Ohm
    9 P1.7 P0.6 33
    9 Reset P0.7 32
    10 P3.0/RX _EA 31
    11 P3.1/TX ALE 30
    12 P3.2 _PSEN 29
    13 P3.3 P2.7 28
    14 P3.4 P2.6 27
    15 P3.5 P2.5 26
    16 P3.6 P2.4 25
    17 P3.7 P2.3 24
    18 Xtal2 P2.2 23
    19 Xtal1 P2.1 22
    1 - GRD 3 - Send NC
    20 GRD P2.0 21

    11.0592Mhz
    Crystal

    m
    2 - TX NC NC

    Starrett Remote Cable Pinout

    Starrett to Mitutoyo SPC Converter


    27 pF 27 pF Copyright 1997-2000 - Matronics
    925-606-1001 / 925-606-6281 FAX
    info@matronics.com Email
    http://www.matronics.com WWW

    REQ Mitutoyo SPC data stream consists of 13, 4-bit digits.


    Digits are sent LSB (2^0) to the MSB (2^3).
    CLK
    d1 - d2 - d3 - d4 - d5 - d6 - d7 - d8 - d9 - d10 - d11 - d12 - d13
    DATA Where:
    d1 = 0xf (4 nybbles of preamble)
    15uS <= t1 <= 115uS d2 = 0xf
    t1 t2 t3 150uS <= t2 <= 250uS d3 = 0xf
    150uS <= t3 <= 250uS d4 = 0xf
    d5 = Sign +:0:0000 / -:8:0001
    Mitutoyo Timing Diagram d6 - d11 = Digits
    d12 = Decimal Point Location 0x2:xxxx.xx, etc.
    d13 = Unit mm:0:0000 / inch:1:1000

    Mitutoyo SPC Protocol Specification

    Starrett SPC data stream consists of 25 ASCII characters. Characters are sent at
    1200 baud, 8 bits (8bit must be masked as it's state is undefined), no parity, and
    2 stop bits. The 25 character stream has the following format:

    1-13 = ASCII Spaces (0x20)


    14 = Space (0x20) if reading is positive, Minus Sign (-) (0x2d) if reading is negative.
    15-21 = ASCII digits representing current reading including a floating decimal point (.) (0x2e).
    22 = Space (0x20).
    23-24 = Current unit in ASCII. Inches = "in", Millimeters = "mm"
    25 = Carriage Return (0x0d)

    Starrett SPC Protocol Specification

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