3
Message Terminators
This instrument recognizes the following message terminators (delimiters):
•
CR
•
CR+LF
Also the terminator for response messages is as follows:
•
CR+LF(USB, RS-232C, GP-IB)
•
LF(Only GP-IB)
Separators
(1) Message Unit Separator
Multiple messages can be written in one line by separating them with semicolons “;”
:RANGe 200pA;*IDN?
• When messages are combined in this way and if one command contains an error, all subsequent messages
up to the next terminator will be ignored.
(2) Header Separator
In a message consisting of both a header and data, the header is separated from the data by a space “ ” (ASCII
code 20H).
:AVERage:COUNt 5
Header portion Space Data portion
(3) Data Separator
In a message containing multiple data items, commas “,” are required to separate the data items from one
another.
:COMParator:BEEPer HI,TYPE1,1
Header data portion comma Data portion
Data Formats
The instrument uses character data, decimal numeric data and character string data depending on the command.
(1) Character Data
Character data always begins with an alphabetic character, and subsequent characters may be either
alphabetic or numeric. Character data is not case-sensitive, although response messages from the instrument
are only upper case. When the command data portion contains
<1/0/ON/OFF>
, the operation will be similar to
when 0 is OFF and 1 is ON.
:HEADER OFF
:HEADER 0
(2) Decimal Numeric Data
Three formats are used for numeric data, identified as NR1, NR2 and NR3. Numeric values may be signed or
unsigned. Unsigned numeric values are handled as positive values. Values exceeding the precision handled by
the instrument are rounded to the nearest valid digit.
• NR1 Integer data (e.g.: +12, -23, 34)
• NR2 Fixed-point data (e.g.: +1.23, -23.45, 3.456)
• NR3 Floating-point exponential representation data (e.g.: +1.0E-2, -2.3E+4)
The term “NRf format” includes all three of the above numeric decimal formats.
The instrument accepts NRf format data. The format of response data is specified for each command, and the
data is sent in that format.
• e.g.: NR1
:AVERage:COUNt 5
• e.g.: NR3
:OPEN:WORK 50E-12
Summary of Contents for Super megohm SM7110
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