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17
Technical Information
Letter Protocol Description
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>
The controller can answers with the following response types:
Tab. 14
Response Type
Logic
Numeric
Alphanumeric
ACK
NACK
Unknown Window
Data Type Error
Out of Range
Win Disabled
240/301
Response
Length
1 byte
6 bytes
10 bytes
1 byte
1 byte
1 byte
1 byte
1 byte
1 byte
TwisTorr 304 FS AG Rack Controller User Manual / 87-901-029-01
Response
Description
Value
-
after a read instruction of a logic
window
-
after a read instruction of a
numeric window
-
after a read instruction of an
alphanumeric window
(0x6)
the command execution has been
successfully completed
(0x15)
the command execution has been
failed
(0x32)
the specified window in the
command is not a valid window
(0x33)
the data type specified in the
command (Logic, Numeric or
Alphanumeric) is not accorded with
the specified Window
(0x34)
the value expressed during a write
command is out of the range value
of the specified window
(0x35)
the specified window is Read Only
or temporarily disabled (for
example you can't write the Soft
Start when the Pump is running)
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