FireFly-IIA User Manual - Jackson Labs Technologies, Inc.

FireFly-IIA User Manual3SCPI-Control QuickStart Instructions3.1 IntroductionThe SCPI (Standard Commands for Programmable Instrumentation) subsystem is accessed via theRS-232 interface and a terminal program. By default the terminal settings are 115200, 8N1.There are a number of commands that can be used as listed below. Most of these are identical orsimilar to Symmetricom 58503A commands. To get a listing of the available commands, send theHELP? query. This will return a list of all the available commands for the FireFly-IIA GPSDO.Additional information regarding the SCPI protocol syntax can be found on the following web site:http://www.scpiconsortium.orgPlease refer to the document SCPI-99.pdf for details regarding individual SCPI commanddefinitions. A basic familiarity with the SCPI protocol is recommended when reading this chapter.3.2 General SCPI Commands3.2.1 *IDN?This query outputs an identifying string. The response will show the following information:, , , 3.2.2 HELP?This query returns a list of the commands available for the FireFly-IIA GPSDO.3.3 GPS SubsystemNote: Please note that FireFly-IIA displays antenna height in MSL Meters rather than in GPS Meterson all commands that return antenna height [the legacy Fury GPSDO uses GPS height]. The NMEA© 2012 Jackson Labs Technologies, Inc. 9