Agilent Technologies Turbo-V 903 Manual De Instrucciones página 284

18 Technical Information
Procedure to Connect the Serial and I/O ports
to an External Cable
Table 4
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.
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<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:
<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.
Turbo-V 903 Pumping System User Manual / 87-901-016-01
Field length Valid characters
1 '0' = off
'1' = on
6 '-', '.', '0' . . . '9' right
justified with '0'
10 from blank to '_' (ASCII)
(A)