Technical Information
RS 232/RS 485 communication description
DATA TYPE FIELD LENGTH VALID CHARACTERS
Logic (L) 1 ‘0’ = off
‘1’ = on
Numeric (N) 6 ‘-‘, ‘.’, ‘0’ . . . ‘9’ right
justified with ‘0’
Alphanumeric (A) 10 from blank to ‘_’ (ASCII)
<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.
NOTE
Using the RS 485 interface, the message structure remains identical to the one
used for the RS 232 interface, the only difference being that the value assigned
The controller can answers with the following response types:
Response types
Type Length Value Description
Logic 1 byte - After a read instruction of a logic
window
Numeric 6 bytes - After a read instruction of a numeric
window
Alphanumeric 10 bytes - After a read instruction of an
alphanumeric window
ACK 1 byte (0x6) The command execution has been
successfully completed
162/178 TwisTorr 304 FS on board Controller User Manual / 87-901-028-01 (C)
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