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Arbiter Systems 120A User Manual

Gnss synchronized clock
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MODEL 120A
GNSS SYNCHRONIZED CLOCK
USER MANUAL
ARBITER SYSTEMS, INC. PASO ROBLES, CA 93446
U.S.A.
WWW.ARBITER.COM

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  • Page 1 MODEL 120A GNSS SYNCHRONIZED CLOCK USER MANUAL ARBITER SYSTEMS, INC. PASO ROBLES, CA 93446 U.S.A. WWW.ARBITER.COM...
  • Page 3 Instrument Configuration Chapter 6 Firmware Updates Appendix A IRIG-B Time code Appendix B Serial Communications and Command Set Appendix C GPS Antenna Placement Copyright Arbiter Systems Incorporated August 2021 All rights reserved. International copyright secured. Publication number: PD0058200A Reorder number: AS011700...
  • Page 4 Description This manual is issued for reference only, at the convenience of Arbiter Systems. Reasonable effort was made to verify that all contents were accurate as of the time of publication. Check with Arbiter Systems at the address below for any revisions made since the original date of publication.
  • Page 5 Products manufactured by Arbiter Systems are guaranteed against defective materials and workmanship under normal use and service from the date of delivery for a period five years. The responsibility of Arbiter Systems under this warranty is limited to repair or replacement, at Arbiter Systems’ option, of any product found to be defective.
  • Page 7 Table of Contents General ................................10 Overview ..............................10 Equipment Included ........................... 10 1.2.1 Model 120A GNSS Synchronized Clock....................10 1.2.2 Antenna Assembly (AP015700) ......................10 1.2.3 Antenna Cable Assembly (CA0034700) ....................10 1.2.4 Mounting Flanges (HD0089800) ......................10 1.2.5 Input / Output Connectors (CN0019202) ...................

  • Page 8: Table Of Contents

    Installation................................15 Instrument..............................15 3.1.1 Location ............................... 15 3.1.1 Instrument Mounting .......................... 15 3.1.2 Power Requirements ........................... 15 Antenna ............................... 16 3.2.1 Antenna Input ............................. 16 3.2.2 Antenna Location ..........................16 3.2.3 Antenna Mounting ..........................16 Configuration ..............................17 4.1.1 Connecting ............................
  • Page 9 Glossary ..............................34 Drawings ..............................35...
  • Page 10 1.2.3 Antenna Cable Assembly (CA0034700) A 5 meter (16 foot) RG-174/U cable is provided to connect the Model 120A to the antenna. The cable is terminated with a female TNC connector on one end and female F connector on the other end and has a characteristic impedance of 50 ohms.
  • Page 11 1.3 Equipment Available 1.3.1 Micro USB Cable (CA0033700) A 6 ft USB 2.0 A male to micro 5 pin male 28/24 AWG Cable w/ Ferrite Core (Gold Plated). 1.3.2 BNC (Male) Breakout to 100 mm Wires (AP0003400) Transitions two wires to a male BNC connection. 1.3.3 BNC (Female) Breakout to 100 mm Wires (AP0008900) Transitions two wires to a female BNC connection.
  • Page 12 RG-174/U, 5 m (16 feet) included. Terminated with TNC and F-Type connectors. 2.2 Interface The Model 120A interface consists of a F-Type antenna connector, 4 LED annunciators, and a twelve-position pluggable 5 mm terminal strip on one panel with a micro USB connector, data LED and a recessed reset button on the opposite panel.
  • Page 13 There is a recessed reset button on right of panel with USB port and LED. The reset button has two functions: 1. Restart the Model 120A: Press the button momentarily to restart. 2. Reset the factory defaults: Press and hold the reset button in until the 4 LEDs next to the output connector start blinking to reset.
  • Page 14 Communication Ports Baud Rate: 115200 Data Bits: 8 Parity: None Stop Bits: 1 Broadcast: Off Time Local offset: 0 hours Daylight Savings Time: Off 2.3 General 2.3.1 Power Requirements Input accepts +8 to +32 Vdc and is not isolated, negative terminal is connected to chassis ground. 2.3.2 Dimensions Chassis: 110 x 85 x 30 mm (4.3 x 3.4 x 1.2 inch) Chassis with mounting brackets: 140 x 85 x 30 mm (5.5 x 3.4 x 1.2 inch)

  • Page 15: Installation

    85˚ C temperature range. The small size allows for the unit to fit in small spaces. The case is not waterproof so it must be kept in a weather protected location. 3.1.1 Instrument Mounting The Model 120A comes with two removable flanges with slots that can be used to secure the unit to a panel or shelf. 3.1.2 Power Requirements The Model 120A accepts a dc input voltage between +8 and +32 Vdc.

  • Page 16: Antenna

    3.2 Antenna 3.2.1 Antenna Input The Model 120A antenna input is a female Type F connector that accepts GNSS signal inputs. The 120A is designed to work with active antennas and supplies 5 Vdc to energize the antenna. 3.2.2 Antenna Location The GPS antenna supplied with the 120A is waterproof and designed for outdoor use in all weather conditions and is designed to mount on the top of the control box through a 23 mm (7/8 inch).

  • Page 17: Configuration

    4 Configuration All clock configuration is performed via the USB port or the RS-232 port using a standard ASCII terminal program and serial commands, there are no physical jumpers or switches to set. Firmware updates are only available over the USB management port. 4.1.1 Connecting The CONFIG PORT and the RS-232 port have equal functionality except firmware updates must use the CONFIG PORT.

  • Page 18: Sending Commands

    Daylight Savings Time is the seasonal adjustment to adjust local time by adding an hour according to your local laws. The Model 120A can be set to off (no time added), on (1 hour added to your local time) and auto (add an hour automatically according to the custom programming).

  • Page 19: Spst Relay Contact

    1-99 minutes. Fault – Indicates if an internal error is affecting proper operation of the Model 120A. The relay contacts will be open in the presence of a fault and closed under normal operation. Please see section 5.3 for detailed fault information.

  • Page 20: Serial Port

    The user must use a terminal program capable of an X-modem transfer to receive the file and when done must log into the Model 120A again. A successful process will look like: >write...

  • Page 21: Operation

    5.1 Startup Upon proper power application the Model 120A Power LED will illuminate green and the bootup process starts. The clock will start off in the unlocked state (Red unlocked LED will be illuminated) and if there are no faults the Locked LED and the Fault LED will be off.

  • Page 22: Faults

    SPI Flash error Internal Flash ready error External Antenna short The 120A antenna output is shorted and is trying to pull more than the maximum allowed current out. Disconnect the antenna cable and check the cable and antenna for issues. OUT1 short The load on output 1 exceeds the 250 mA maximum.

  • Page 23: Firmware Updates

    120A Main: 1.02-4 Boot: 1.00-10 FPGA: 1.00 Username: 6.3 Verifying To verify the firmware has been updated, log into the Model 120A and send the “firmware” command. The Model 120A will respond with: 120A Main: 1.02-4 Boot: 1.00-10 FPGA: 1.00...

  • Page 24: Appendix

    7 Appendix 7.1 IRIG-B Timecode IRIG-B is a serial time code developed by the US military’s Inter-Range Instrumentation Group for range. The IRIG- B timecode has a time frame of 1 second with an index count of 10 milliseconds and contains Time Of Year (TOY) in days, hours, minutes, seconds, and year information in a BCD format and seconds-of-day in SBS.

  • Page 25: Serial Commands

    ON in the clock. To view details of the IEEE Std C37.118.1, please check with the IEEE. The Model 120A supports the unmodulated (DC level shift) versions of the IRIG-B standard B000 and B003, B004 (RCC 200-16) in both local or UTC time. The control functions of B000 and B004 follow IEEE C37.118 timing specifications.
  • Page 26 Administration Commands (Admin) Function Command Action / Response Console Timeout timeout {<min>} Sets the inactivity time before automatically logging the user out. Range: 1 to 60 minutes. If no number is included then the current setting is returned. Update Firmware firmware {<update>} Start binary file transfer (Xmodem send)…...
  • Page 27 Configuration Commands (Config) Function Command Action / Response Select Satellite Systems gnss <sat-sys> {<sat-sys> {<sat-sys>}} Where: <sat-sys> = GPS, GLONASS, Galileo, BEIDOU Set Antenna Cable Delay gnss <Antenna Delay> Where: <Antenna Delay> = 0-999999ns Set Daylight Saving Time dst <off | on | auto> Where: off = no hours added to local time on = 1 hour added to local time...
  • Page 28 Configuration Commands (Config) Function Command Action / Response Set Relay Signal relay <mode> Where: <mode> = disabled, OOL (Out of Lock), fault, close, open, PPM (Pulse relay OOL {fault} per Minute), PPH (Pulse per Hour), PPD (Pulse per Day), ST (Single Trigger).
  • Page 29 Displays the correct syntax and options for the listed command. Where <command> is any of the available commands for the user role. Show Current Status status Displays the 120A status. Example: Receiver Version: SW=ROM CORE 3.01 (107888) HW=00080000 GNSS: GPS GLONASS Galileo BEIDOU...
  • Page 30 Status Commands (Read Only) Function Command Action / Response Show Serial Port Setting ser{ial} Displays the serial port settings. Example: serial: 115200,8,1,N Show Serial Broadcast Setting br{oadcast} Displays the broadcast mode. Example: broadcast: ASCII Std(1) UTC Show Custom Broadcast String br{oadcast} custom Displays the current custom broadcast string...

  • Page 31: Constructing A Custom String

    7.3 Constructing a Custom String This section provides the character set and rules for constructing a custom string. At the end of this section is a tutorial on how to construct strings using some of the standard broadcast strings as examples. Custom Broadcast Character Set Character Meaning...
  • Page 32 < t > = True condition < f > = False condition ii: 01 = Locked; 02 = Status change; 03 = Locked with max accuracy; 04 = Fault; 05 = Daylight Saving Time change pending; ; 06 = Unlocked LED status (whether Unlocked LED On/O↵) Ordinal Condition Command: /{ii? <...

  • Page 33: Custom Broadcast String Setup Example

    Common ASCII Characters Listed below are a few common ASCII control characters used with the Model 120A clock. For a more complete listing of ASCII characters, you will need to consult an additional source. Other printable characters may be typed in as seen on a keyboard.

  • Page 34: Troubleshooting

    Model 120A to power on but continually reset only illuminating the Power LED. Model 120A will not lock to satellites: Check the antenna cable and antenna for any damage. Use the ASCII status command to check for faults and tracking information.
  • Page 35 7.6 Clock Drawings...

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