Agilent Technologies TwisTorr 74 FS AG - Page 176

Technical Information
Description
176/192 TwisTorr 74 FS AG On-board Controller User Manual / 87-901-054-01
 <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:
DATA TYPE FIELD LENGTH VALID CHARACTERS
Logic (L) 1 “0” = OFF
“1” = ON
Numeric (N) 6 “-“, “.“, “0”…”9” right justified with “0”
Alphanumeric (A) 10 From blank to “_” (ASCII)
 - <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.
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.