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DATA PROTOCOL
PARAMETER DESIGNATIONS

TM-5-3895-374-24-2 M081 Asphalt Mixing Plant Manual
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TM 5-3895-374-24-2 955-257 5.11 DATA PROTOCOL DEFINITIONS * -Standard ASCII character used by the host computer to initiate a command. : -Standard ASCII character used as a field separator. / -Standard ASCII character used as a separator between the PARAMETER mnemonic and the data in a WRITE command. $ -Standard ASCII character used by the controller as the first character in a response. UNIT # -ASCII 0 to 63.  The’ unit address Identification is by means of binary weighted internal switches on the controller communications board.  The unit address can be omitted in transmissions when only one unit is involved and address switches are set to all zeros.  (See Section 5.8.) R -READ command W -WRITE command PARAMETER -Controller variable shown as a three-character ASCII mnemonic.  ONLY UPPER CASE CHARACTERS MAY BE USED. CKSUM -TWO ASCII hexadecimal characters representing an eight-bit checksum formed by adding each byte of the string preceding the checksum into an eight-bit accumulator and ignoring any overflow.  The resulting eight-bit sum is sent as two hexadecimal characters.  The high order four bits are the first characters and the low order four bits are the last character. CKSUM is optional with the user. CR -Carriage Return LF -Line Feed STATUS -Two ASCII coded hexadecimal characters defining the system status. DATA -A string of ASCII digits, including minus sign where appropriate, representing the numerical value of the PARAMETER specified.  Limited to four character spaces. ECLIPSE INSTRUMENTATION DIVISION page 3-1111







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