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Technical Information
Old Serial Protocol ("Binary Protocol")
The "Binary Protocol" serial protocol used by some old controllers is no longer
supported.
For new projects, Agilent advises that the new protocol "Window protocol" be used.
Nevertheless, for compatibility with the old systems, some commands of the
"Binary Dual" have been implemented.
The 4UHV controller cannot implement all the commands of the Dual but only a
subset.
Communications Format
These protocols have the following formats:
Table 14
Type
Read
Status
Integer
BitField
Exponential
String
The "h" notation following a number indicates that the number is expressed in
3
hexadecimal format.
BCD: The number is represented by digits included within the "0" and "9" range
4
(ASCII 30h - 39h).
5
Status can also assume values greater than "1".
208
No. of Bytes
Description
1
"?" (3Fh
1
"0" (30h) = false = off,
"1" (31h) = true = on
5
"xxxxx" represented in BCD
positive)
8
Like integer type, but meanings are associated with the
single bits of the number.
7
"x.xEsxx" where x is BCD digits, E is the 45h character
and s is the ("+" or "-" sign).
n
Sequence of n characters included within the 20h and
7Fh range
Agilent 4UHV Ion Pump Controller User Manual
) performs reads on the Splitter Box
3
5
with 5 digits (always
4
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