Agilent Technologies TwisTorr 304 FS AG Manual De Instrucciones página 239

<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 to write
into the window
<DATA> = an alphanumeric ASCII string with the data to be
written into the window. In case of a reading command this field
is not present. The field length is variable according to the data
type as per the following table:
Tab. 13
Data Type
Logic (L)
Numeric (N)
Alphanumeric (B)
<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 from the MESSAGE type. When the MESSAGE
is a reading command, the SLAVE will respond transmitting a
string with the same structure of the MESSAGE.
TwisTorr 304 FS AG Rack Controller User Manual / 87-901-029-01 (C)
Field Length Valid Characters
1 '0' = OFF
'1' = ON
6 '-', '.', '0' . . . '9' right justified with '0'
10 from blank to '_' (ASCII)
Technical Information
Letter Protocol Description
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