Agilent Technologies 4UHV, User Manual

Page: 88 / 105

Technical Information
Serial
5
Agilent 4UHV Ion Pump Controller User Manual / 87-900-137-01 (A) 87/104
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 11
Type No. of
Bytes
Description
Read 1 “?” (3Fh
3
) performs reads on the Splitter Box
Status 1 “0” (30h) = false = off,
“1” (31h) = true = on
5
Integer 5 “xxxxx” represented in BCD
4
with 5 digits (always positive)
BitField 8 Like integer type, but meanings are associated with the single
bits of the number.
Exponential 7 “x.xEsxx” where x is BCD digits, E is the 45h character and s is
the (“+” or “-“ sign).
String n Sequence of n characters included within the 20h and 7Fh range
3
The “h” notation following a number indicates that the number is
expressed in hexadecimal format.
4
BCD: The number is represented by digits included within the “0”
and “9” range (ASCII 30h - 39h).
5
Status can also assume values greater than “1”.
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