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Chapter 6, COMPUTER OPERATION
6.7 Command Descriptions
6.7.01 Signal Channel
IMODE [n]
VMODE [n]
6-10
if present may optionally be followed by n
are equivalent. Terminator bytes are defined in section 6.3.09.
Where the command syntax includes optional parameters and the command is
sent without the optional parameters, the response consists of a transmission of
the present values of the parameter(s).
Any response transmission consists of one or more numbers followed by a response
terminator. Where the response consists of two or more numbers in succession, they
are separated by a delimiter (sections 6.3.09, 6.3.04, and 6.5.05).
Some commands have an optional floating point mode which is invoked by
appending a . (full stop) character to the end of the command and before the
parameters. This allows some parameters to be entered or read in floating point
format. The floating point output format is given below.
±1.234E±01
The number of digits between the decimal point and the exponent varies depending
on the number but is a minimum of one and a maximum of eight. The input format is
not as strict but if a decimal point is used there must be a digit before it. An exponent
is optional. The following are all legal commands for setting the oscillator frequency
to 100.1 Hz:-
OF. 100.1
OF. 1.001E2
OF. +1.001E+02
OF. 1001E-1
This section lists the commands in logical groups, so that, for example, all
commands associated with setting controls which affect the signal channel are shown
together. Appendix G gives the same list of commands but in alphabetical order.
Current/Voltage mode input selector
The value of n sets the input mode according to the following table
n
Input mode
0
Current mode off - voltage mode input enabled
1
High bandwidth current mode enabled - connect signal to B (I) input connector
2
Low noise current mode enabled - connect signal to B (I) input connector
If n = 0 then the input configuration is determined by the VMODE command.
If n > 0 then current mode is enabled irrespective of the VMODE setting.
Voltage input configuration
The value of n sets up the input configuration according to the following table:
n
Input configuration
0
Both inputs grounded (test mode)
1
A input only
2
-B input only
3
A-B differential mode
. Upper-case and lower-case characters
2
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