Agilent Technologies TwisTorr 74 FS AG User Manual page 176

Technical Information
Description
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DATA TYPE
Logic (L)
Numeric (N)
Alphanumeric (A)
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The addressed SLAVE will respond with an ANSWER whose
structure depends on the MESSAGE type. When the MESSAGE is a
read command, the SLAVE will respond transmitting a string with
the same structure.
176/192
<STX> (Start of transmission) = 0x02
<ADDR> (Unit address) = 0x80 (for RS-232)
<ADDR> (Unit address) = 0x80 + device number (0 to 31) (for RS-
485)
<WIN> (Window) = a string of 3 numeric character indicating the
window number (from "000" to "999"); for the meaning of each
window see the relevant paragraph.
<COM> (Command) = 0x30 to read the window, 0x31 towrite into
the window.
<DATA> = an alphanumeric ASCII string with the data to
bewritten into the window. In the case of a read command, this
field is not present. Field length varies according to the data type
as per the following table:
FIELD LENGTH
1
6
10
- <ETX> (End of transmission) = 0x03
- <CRC> = XOR of all characters subsequent to <STX> and
including the <ETX> terminator. The value is hexadecimal coded
and indicated by two ASCII character.
TwisTorr 74 FS AG On-board Controller User Manual / 87-901-054-01
VALID CHARACTERS
"0" = OFF
"1" = ON
"-", ".", "0"..."9" right justified with "0"
From blank to "_" (ASCII)