© 2019 Jackson Labs Technologies, Inc. 13
Micro-JLT GNSS™ User Manual
SCPI-Control Quick
Start Instructions
3.1 Introduction
The SCPI (Standard Commands for Programmable Instrumentation) subsystem is accessed via the
RS-422/TTL serial interface and a terminal program. By default the terminal settings are 115200,
8N1, no flow-control.
There are a number of commands that can be used as listed below. Most of these are identical or
similar to Symmetricom 58503A commands. To get a listing of the available commands, send the
HELP? query. This will return a list of all the available commands for the Micro-JLT GNSS™
GNSDO.
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. Note that the
symbols ‘<’, ‘>’, ‘[’, ‘]’, ‘|’, and ‘,’ in the parameter field listed in some commands of Chapter 3 are
used for ranging or separating ONLY. Do not include these symbols when sending the SCPI
commands to avoid Command Error response.
3.2 General SCPI Commands
3.2.1 Quick Start Commands
For a quick start, try the following SCPI serial port commands.
Note that all lower case letters in SCPI commands throughout the User Manual are optional. The
abbreviated version of the SCPI commands such as SYST:STAT? and SYNC? will also work.
HELP?
SYSTem:STATus?
GPS?
SYNChronization?
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