Agilent Technologies TV 301 Mode D'emploi page 245


Tab. 6
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
NOTE
used for the RS 232 interface, the only difference being that the value assigned
to the ADDRESS <ADDR>
TV 301 Navigator User Manual / 87-900-946-01 (N)
<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:
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.
Technical Information
RS 232/RS 485 communication description
VALID CHARACTERS
'0' = off
'1' = on
'-', '.', '0' . . . '9' right
justified with '0'
from blank to '_' (ASCII)
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