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Technical Information
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 15
Field
Header
command
Header
response
Length
Command
Channel
Data
Checksum
Agilent 4UHV Ion Pump Controller User Manual
No. of
Value
Description
Bytes
1
81h
Header for the RS232 and RS422 serial.
81h÷A0h
Header and address for the RS485 (129 – 160) serial.
01h
Header for the serial RS232, RS422.
01h÷20h
Header and address for the RS485 serial.
2
Data packet length in BCD (command, channel, data fields only).
See description of commands (byte 0 command, byte 1
subcommand).
30h
No channel
1
31h
High Voltage 1
32h
High Voltage 2
33h
High Voltage 3
34h
High Voltage 4
N
See description of commands
1
XOR of all bytes (checksum excluded) in and with 7Fh.
209
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