Technical Information
Serial
5
Agilent 4UHV Ion Pump Controller User Manual / 87-900-137-01 (A) 75/104
The Window Protocol is the same of the Turbo Pump, but the
meaning of the Window is different (see the below chapter: Windows
Description).
Communications Format
8 data bit
No parity
1 stop bit
Baud rate: 9600
Communications Protocol
The communications protocol is of MASTER/ SLAVE type, where:
Host = MASTER
Controller = SLAVE
The communication takes place as follows:
1 The host (MASTER) sends a MESSAGE + CRC to the controller
(SLAVE)
2 The controller answers with an ANSWER + CRC to the host.
3 The MESSAGE is a string in the following format:
4 <STX>+<ADDR>+<WIN>+<COM>+<DATA>+<ETX>+<CRC>
NOTE
When data is indicated between two quotes (‘...’), it implies that the data
indicated is the corresponding ASCII character.
Where:
<STX> (Start of transmission) = 0x02
<ADDR> (Unit address) = 0x80 (for RS232)
<ADDR> (Unit address) = 0x80 + device number (0 to 31) (for
RS485)
<WIN> (Window) = a string of 3 numerics indicating the window
number (from ‘000’ to ‘999’); for the meaning of each window, see
the relevant paragraph.
This Manual: http://www.manuallib.com/file/2630540
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