SDI CS-1 Manuel du propriétaire

SDI

SPECTRADYNAMICS, INC.

9.192 GHZCESIUM FREQUENCY SYNTHESIZER

CS-1

PROGRAMMING MANUAL

SPECTRADYNAMICS, INC •1849 Cherry St. Unit 2 •Louisville, CO 80027

Phone: (303) 665-1852 •Fax: (303) 604-6088

www.spectradynamics.com

Description……………………………………………………………..………. 2

RS-232 Port……………………………………………………………….…..... 3

Communication Screen………………………………………………………... 4

ASCII Command Set.……………………………………………..…………... 5

State Machine ASCII Command Set..……………………………………….. 32

Troubleshooting……………………………….……………………………….. 43

Table of Contents

SDI

The CS-1 is a versatile low noise synthesizer with an output frequency range of

9.18963177 GHz to 9.19563177 GHz. The CS-1 is designed to be used in the

implementation of a Cesium atomic clock. The unit is provided in a 2U, 19 inch rack-

mount enclosure. All synthesizer functions are accessed from the front panel or a

RS-232 interface. An external trigger input may be used to synchronize programmable

events such as frequency sweeps, phase modulation and amplitude modulation with

external events.

The synthesizer has 48-bit frequency resolution, 14-bit phase resolution and 12-bit

amplitude control. All instrument functions and settings are displayed and controlled via

the front panel LCD display and keypad. Remote control of the instrument is possible

through RS-232 communications. This manual describes the RS-232 ASCII command

set of the CS-1 synthesizer.

Description

SDI

SPECTRADYNAMICS,INC •1849 Cherry St. Unit 2 •Louisville, CO 80027 •Phone: (303) 665-1852 •Fax: (303) 604-6088

www.spectradynamics.com

Se habla español

RS-232 Communication Port

The CS-1 Synthesizer Module functions are accessed through the RS-232 port located

on the front panel. A standard serial cable with a DB-9 connector can be used to

interface to the unit. The user can input commands using a simple dumb terminal

program on a remote computer or more sophisticated control can be used with software

such as Labview.

On the front panel above the RS-232 connector there are 3 LEDs. The power LED

labeled ON should be lit when power is applied. The second LED labeled DATA will

light up only when data is being received or sent on the RS-232 port. This LED can be

used to verify that the unit is communicating. The third LED is labeled status and is a

hardware representation of the internal status flag. The status LED is on whenever an

error has occurred. The user must query the unit to determine the source of error and

then clear the error flag. When the error flag is cleared the LED will turn off.

Port Settings

On power-up the RS-232 port settings are:

Baud rate 9600 8 Bits 1 Stop Bit No Parity.

Hardware handshaking is not used. The DB-9 connector pin-out is described below.

Pin Function

1 NC

2 Data out

3 Data in

4 NC

5 GND

6 NC

7 NC

8 NC

9 NC

RS-232 Port

SDI

Communications Screen The communications screen displays the current RS-232

serial port settings. The soft keys at the bottom of the screen are used to set

new RS-232 settings, initiate RS-232 control of the instrument or test the serial

port connection. The RS-232 port is setup to be controlled by a dumb terminal.

A null modem adapter is not needed and should not be used. Hardware

handshaking is not used. For additional pin-out information please refer to the

RS-232 port section on page 3 of this manual.

DISPLAYS

Current baud rate setting.

REM Enter remote RS-232 control mode.

BAUD Toggle through available baud rates.

9600, 19200, 38400, 57600, 115200, 14400, 28800

LOCAL Return to local control and terminate remote RS-232 control

session.

EXIT Exit to previous screen.

SDI

Communications Screen

The CS-1 command set is used to control most synthesizer functions. The characters

sent to the CS-1 must be upper case ASCII characters.

Command Summary Description Page

AMASK [rt] Set amplitude ramp time 7

AMASK? Query amplitude ramp time setting 7

AMPL [ampl] [aunits] Set amplitude in dBm, Vrms or Vpp 8

AMPL? Query amplitude 8

ASK[askcmd] Start/stop amplitude shift keying 9

BAUD [baud] Change baud rate 10

BAUD? Query baud setting 10

COFF [df] Set frequency offset from Cs frequency 11

COFF? Query frequency offset from Cs frequency 11

DATE [mo/day/yr] Change date 12

DATE? Query date 12

FMFSK [f1][f2] Set frequency shift parameters 13

FMFSK? Query frequency shift parameters 13

FMSWP [f1][f2][df][rate] Change frequency sweep parameters 14

FMSWP? Query frequency sweep parameters 14

FOFF [df] Change frequency setting 15

FOFF? Query frequency setting 15

FSK [fskcmd] Start/stop frequency shift keying 16

FREQ [freq] Change frequency setting 17

FREQ? Query frequency setting 17

HELP Basic help on ASCII command set 18

LOCL Return to local control 19

PHAS [phase] Set synthesizer phase 20

PHAS? Query synthesizer phase 20

PLL [pllcmd] Set Int/Ext frequency reference 21

PLL? Query phase lock loop status 22

PMPSK [p1][p2] Set phase shift keying parameters 23

PMPSK? Query phase shift keying parameters 23

PSK [pskcmd] Enable/disable phase shift keying 24

RFPWR [rf] Turn on/off RF power 25

RFPWR? Query RF power setting 25

SWP [swpcmd] Start/stop frequency sweep 26

TEMP? Query instrument temperature 27

SDI

ASCII Command Set

TIME [hr:min:sec] Change instrument time of day 28

TIME? Query time of day 28

TRIG Software trigger signal 29

*RST Reset synthesizer 30

*SRE Get status byte 31

*CLS Clear status byte 31

Command Arguments_______________________________________________________

rt Amplitude ramp time from on/off or off/on. {164uS –10485uS }

ampl Amplitude entered in units indicated by aunit –10 dBm to +15 dBm}

aunits Amplitude units {1 –dBm, 2 –Vrms, 3 –Vpp}

askcmd Amplitude shift command {0 –off, 1 –on/trigger, 2 –signal on, 3 –signal off}

auxcmd Auxiliary output command {0 –off, 1 –on}

baud Serial port baud rate. The default is 9600.

mo Month {1 –12}

day Day {1 –31}

year Year {1900 –2100}

f1 Start frequency in Hz {9189631770 Hz –9195631770 Hz}

f2 Stop frequency in Hz {f1 –9195631770 Hz}

df Step frequency in Hz {1uHz –6MHz)}

rate Step rate in Hz {48 Hz –25 MHz}

fskcmd Frequency shift keying command {0 –off, 1 –on/trigger, 2 –set f1, 3 –set f2}

freq Frequency in Hz {9189631770 Hz –9195631770 Hz }

phase Phase in degrees {+/- 360}

pllcmd Pll command {0 –DC Tuning, 1 –Lock to Ext 5 MHz}

p1 First phase setting in degrees {+/-360}

p2 Second phase setting in degrees {+/-360}

rf Parameter to turn on/off RF power {0 –off, 1 –on}

pskcmd Phase shift command {0 –off, 1 –on/trigger, 2 –set p1, 3 –set p2}

swpcmd Sweep command {0 - off, 1 –on/trigger, 2 –autosweep}

hr Hour {0 –23}

min Minute {0 –59}

sec Second {0 –59}

SDI

ASCII Command Set

SDI

AMASK sets the ramp time of the output amplitude from off to on or on to off.

AMASK [rt]<cr>

AMASK has 1 parameter and is executed following the carriage return <cr>

rt valid values are in micro-seconds: 164 –10485

Example: AMASK 165<cr>

Sets the ramp time to 165 microseconds. <cr> is a carriage return.

AMASK? Queries the synthesizer ramp time setting.

AMASK?<cr>

AMASK? is executed following the carriage return <cr>

The results of the query are in the following format.

AMASK? [rt]<cr>

Example: AMASK?<cr>

Queries the ramp time setting of the synthesizer. <cr> is a carriage return.

The function will return:

AMASK? 165<cr>

SDI

AMASK, AMASK?

AMPL sets the synthesizer amplitude.

AMPL [ampl][aunits]<cr>

AMPL has 2 parameters and is executed following the carriage return <cr>

ampl amplitude in desired unit specified by aunits

aunits amplitude units desired

valid values:

ampl aunits units

-10 to +15 1 dBm

0.071 to 1.26 2 Vrms

0.2 to 3.56 3 Vpp

Example: AMPL 13.0 1<cr>

Sets the amplitude to 13.0 dBm. <cr> is a carriage return.

AMPL? Queries the synthesizer amplitude setting.

AMPL?<cr>

AMPL? is executed following the carriage return <cr>

The results of the query are in the following format.

AMPL? [ampl][units]<cr>

Example: AMPL?<cr>

Queries the amplitude setting of the synthesizer. <cr> is a carriage return.

The function will return:

AMPL? 13.0 dBm<cr>

SDI

AMPL, AMPL?

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