SV 971A User Manual – Appendixes
APPENDIX A. REMOTE CONTROL
The USB 2.0 interface is the Type C serial interface working with 480 MHz clock which enables one to
control remotely the unit. Its speed is relatively high, and it ensures the common usage of USB-C in most
produced nowadays Personal Computers.
Alternatively, all commands described in this appendix are valid for any other kinds of interfaces (if present)
like Bluetooth communication or RS232.
Functions, which are developed in order to control data flow in the serial interfaces, ensure:
- Bi-directional data transmission,
- Remote control of the instrument.
In order to program the serial interface, the user has to:
1. send a "function code",
2. get a response to the “function code”
3. send/receive a data file (optionally)
A.1 INPUT/OUTPUT TRANSMISSION TYPES
Following basic input/output transmission types (called functions) are available:
#1 – general control functions,
#2 – read out of the measurement results in the SLM mode,
#3 – read out of the measurement results in the 1/1- or 1/3 Octave analysis mode,
#4 – read out data from the setup file,
#5 – read out of the statistical analysis results,
#7 – special control functions,
#9 – writing data to the setup file,
#D – data files access,
#S – direct setup access.
A.2 FUNCTION #1 – GENERAL CONTROL FUNCTIONS
#1 function enables the user to send the control setting codes to the instrument and read out a file containing
the current control state. A list of the control setting codes is given in A.3 Control setting codes. The format
of #1 function is defined as follows:
#1,Xccc,Xccc,(...),Xccc; (1)
or
#1,Xccc,X?,Xccc,(...),X?,Xccc; (2)
or
#1,X?,X?,(...),X?; (3)
where:
X - group code, ccc – new code value,
X? - request to send the current X code setting.
In the first case (1) the instrument does not respond to a command, even if an error occurs.
In the second and third cases (2), (3) the instrument outputs control settings for all requests X? in the following
format:
#1,Xccc,Xccc,(...),Xccc;
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