Agilent Technologies TwisTorr 74 FS AG - Page 177

Technical Information
Description
17
NOTE
Using the RS-485 interface, message structure is identical to that used for the
RS-232 interface, the only difference being the value assigned to the ADDRESS
<ADDR>
The controller can answer with the following types of replies:
Response type Response length Response 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) Execution of the command has been completed
successfully.
NACK 1 byte (0x15) Execution of the command has failed.
Unknown Window 1 byte (0x32) The window specified in the command is not a
valid window.
Data Type Error 1 byte (0x33) The data type specified in the command (Logic,
Numeric or Alphanumeric) does not match the
window specified.
Out of Range 1 byte (0x34) The value expressed during a write command is
outside the range of value of the window
specified.
Win Disable 1 byte (0x35) The window specified is Read Only or
temporarily disabled (for example, Soft Start
cannot be written when the Pump is running).
TwisTorr 74 FS AG On-board Controller User Manual / 87-901-054-01 177/192