Scpi Command Reference; Introduction - Jackson Labs RSR GNSS Transcoder User Manual

SCPI Command
Reference

4.1 Introduction

The RSR GNSS Transcoder™ can typically be used in one of three operating modes. The following
SCPI commands are used to control and monitor these operating modes. The available modes are:
1) Static position simulation with only time/date advancing
2) Dynamic position simulation with position, velocity, heading, and
time/date advancing based on external commands, or following motion
vectors stored in internal NV memory
3) Real-time PVT transcoding where the RF output simulation follows
externally-provided 1Hz PVT NMEA reference strings as well as externally
provided 1PPS reference UTC timing pulses
The RSR GNSS Transcoder™ includes a USB connector (U2) for accessing the SCPI (Standard
Commands for Programmable Instrumentation) subsystem by using a host system terminal program
such as TeraTerm or HyperTerminal. By default the terminal settings are 115200, 8N1, no
flow-control. The SCPI interface can be used to query status of the unit, generate NMEA compatible
output sentences, or setup and control simulations and transcoding.
There are a number of commands that can be used as listed below. Many of these are identical or
similar to Symmetricom/Agilent 58503A commands. To get a listing of the available commands,
send the HELP? query. This will return a list of all the available commands and their syntax.
Commands can be entered in either caps or lower-case, and only the characters listed in caps in the
below command reference need to be typed-in.
Additional information regarding the SCPI protocol syntax can be found on the following web site:
http://www.ivifoundation.org/scpi/
A basic familiarity with the SCPI protocol is recommended when reading this chapter.
As many setup commands use standard GPS nomenclature, JLT recommends review and
consideration of the GPS standard specification IS-GPS-200 available here:
http://www.gps.gov/technical/icwg/
© 2017 Jackson Labs Technologies, Inc.
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