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Technical Information
<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.
Using the RS 485 interface, the message structure remains identical to the one
NOTE
used for the RS 232 interface, the only difference is the value assigned to the
ADDRESS <ADDR>.
The controller can answer with the following response types:
Table 7
Type
Logic
Numeric
Alphanumeric
ACK
NACK
Unknown Window
Data Type Error
Out of Range
Win Disabled
Agilent TwisTorr 305-IC User Manual
Controllers' response types
Length
1 byte
6 bytes
10 bytes
1 byte
1 byte
1 byte
1 byte
1 byte
1 byte
Value
Description
-
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)
255
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