Agilent Technologies TwisTorr 84 FS PCB 24 Bedienungshandbuch Seite 192

17 Technical Information
Data Exchange Protocols


Tab. 6
Logic (L)
Numeric (N)
Alphanumeric (A)


Only the addressed SLAVE will respond.
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>
192/210
For host messages this field is present only in case of writing
containing logic, numeric or alphanumeric data types according
to the following table.
For controller messages this field is always present containing
the required data (logic, numeric or alphanumeric) in case of
reading or the relevant protocol answer in case of writing
acknowledge or protocol errors.
Length
1
6
10
<ETX> (End of transmission) = one character containing 0x03
<CRC> = two characters containing XOR of all characters
subsequent to <STX>
and including the <ETX> terminator. The value is hexadecimal
coded and indicated by two ASCII character.
TwisTorr 84 FS PCB 24 Vdc Controller User Manual / 87-901-039-01 (B)
Characters Permitted
'0'= off
'1'= on
'-', '.', '0' . . . '9' right
justified with '0'
from blank to '_' (ASCII)