Agilent Technologies MS40+, Руководство пользователя

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Technical Information
RS 232/RS 485 Communication Description
5
MS40+ Single Stage Rotary Vane Pumps User Manual / 87-901-008-01 ( E) 77/90
Tab. 7
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)
ƒ <ETX> (End of transmission) = 0x03
ƒ
<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.
The controller can answers with the following response types:
Tab. 8
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
NACK 1 byte (0x15) the command execution has been failed
Unknown
Window 1 byte (0x32) the specified window 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) is not
accorded with the specified Window