Agilent Technologies 4UHV, User Manual

Page: 89 / 105

5
Technical Information
Serial
88/104 Agilent 4UHV Ion Pump Controller User Manual / 87-900-137-01 (A)
The commands have a read and a write mode. By specifying the type
of read operation being performed, the Host queries the Splitter Box
that, in turn, replies in a format that is compliant with the command
sent. As long as a write operation can be carried out, the write and
read formats for the same command coincide.
Host to Dual controller command format:
[header command] [length] [command] [channel] [data] [checksum]
Dual controller to Host reply format:
[header response] [length] [command] [channel] [data] [checksum]
Table 12
Field No.
of
Bytes
Value Description
Header
command 1 81h
81h÷A0h
Header for the RS232 and RS422 serial.
Header and address for the RS485 (129 – 160) serial.
Header
response 01h
01h÷20h
Header for the serial RS232, RS422.
Header and address for the RS485 serial.
Length 2 Data packet length in BCD (command, channel, data
fields only).
Command See description of commands (byte 0 command, byte 1
subcommand).
Channel 1 30h
31h
32h
33h
34h
No channel
High Voltage 1
High Voltage 2
High Voltage 3
High Voltage 4
Data N See description of commands
Checksum 1 XOR of all bytes (checksum excluded) in and with 7Fh.
Command Listing
It is not possible to implement all the “Binary Dual” protocol
commands on the 4UHV controller. The commands that are
implemented on the 4UHV controller are the following:
This Manual: http://www.manuallib.com/file/2630540