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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
Communications Protocol
The communications protocol is of MASTER/ SLAVE type, where:
The communication takes place as follows:
1
2
3
4
When data is indicated between two quotes ('...'), it implies that the data
NOTE
indicated is the corresponding ASCII character.
Where:
Agilent 4UHV Ion Pump Controller User Manual
8 data bit
No parity
1 stop bit
Baud rate: 9600
Host = MASTER
Controller = SLAVE
The host (MASTER) sends a MESSAGE + CRC to the controller
(SLAVE)
The controller answers with an ANSWER + CRC to the host.
The MESSAGE is a string in the following format:
<STX>+<ADDR>+<WIN>+<COM>+<DATA>+<ETX>+<CRC>
<STX> (Start of transmission) = 0x02
<ADDR> (Unit address) = when you select the RS232
communication, this field is not handled and the controller
always answers with its address stored in EEPROM
<ADDR> (Unit address) = 0x80 + device number (0 to 31) (for
RS485)
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