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Agilent Technologies TwisTorr Medium-TMP Notice De Mode D'emploi page 233

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Tab. 19
Data Type
Logic (L)
Numeric (N)
Alphanumeric (A)
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.
Using the RS 485 interface, the message structure remains identical to the one used for
NOTE
the RS 232 interface, the only difference being that the value assigned to the ADDRESS
<ADDR>.
TwisTorr Medium-TMP Rack Controller User Manual / 87-901-049-01
<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:
<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.
RS 232/RS 485 Communication Description
Field Length
Valid
Characters
1
'0' = OFF
'1' = ON
6
'-', '.', '0' . . . '9' right
justified with '0'
Up to 14
from blank to '_' (ASCII)
Technical Information
233/284
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X3501-64016X3501-64006