Agilent Technologies 4UHV, User Manual

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Technical Information
Serial
5
Agilent 4UHV Ion Pump Controller User Manual / 87-900-137-01 (A) 77/104
Table 6
Data Type Field Length Valid Characters
Logic (L) 1 ‘0’ = OFF
‘1’ = ON
Numeric (N) 6 ‘-‘, ‘.’, ‘0’ . . . ‘9’ right justified with ‘0’
Alphanumeric (A) 10 From blank to ‘_’ (ASCII)
ƒ
<ETX> (End of transmission) = 0x03
ƒ <CRC> = XOR of all characters following <STX> and including the
<ETX> terminator. The value is hexadecimal coded and
represented by two ASCII characters.
The SLAVE addressed responds with an ANSWER whose structure
depends on the MESSAGE type.
When the MESSAGE is a read command, the SLAVE responds
transmitting a string with the same structure as the MESSAGE.
NOTE
Using the RS485 interface, the message structure is identical to that used for
the RS232 interface, the only difference being the value assigned to the
ADDRESS <ADDR>.
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