Message Structure - Agilent Technologies Turbo-V 2000HT 969-9562 Bedienungshandbuch

17 Technical Information
Optional Serial Port

Message Structure

(request and answer have the same format)
The master system (PC) starts every session sending the following
message to the slave units connected:
<STX> / <ADDR> + <WINDOW> + <COMMAND> + <DATA> + <ETX>
+ <CRC>
where:
<STX>=
<ADDR> =
<ADDR> =
<WINDOWS>=
<COMMAND>= 0x30: window value reading
<DATA> =
<ETX>=
<CRC>=
256/306
0x02
0x80 (for RS 232 and RS 422 only)
0x80 + device number (0...31)
0xFF: brodcasting command (recognized by all the
devices, it doesn't implicate any answer)
(for RS 485 only)
' 000 '...' 999' window number the meaning of the
window depends to the device type
0x31: window writing
alphanumeric ASCII string containing, in the case of
writing operation,the parameter to input into the
window addressed by the field <WINDOW>This
field may have variable length according to the data
type contained in the windo where you are working
in. In the case of reading request of a window, the
data field doesn't exist.
0x03
XOR among all the characters following
<STX>=(with exception of <STX>), including the end
character <ETX> hexadecimally encoded by two
ASCII characters.
Turbo-V 2000HT Controller User Manual / 87-900-913-01 (O)