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TrueTime 800 Series General Information Manual

Time code unit
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1.1
Scope of Manual
This manual contains the information necessary to operate and maintain a TrueTime 800
Series Time Code Unit (TCU).
1.2
Conventions
The conventions used in this manual are:
Text
Italics
Caution
WARNING
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text
800gench1.fm Rev. A
This unit may contain Custom Options and/or Configurations. A description
can be found starting on sheet iii of the index. This description may modify or
supersede descriptions or specifications elsewhere in this manual.
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Indicates body text
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Emphasizes important information
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Used with bold text to call attention to important information
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Used with bold text to identify potential damage to equipment
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Used with bold text to identify potential injury
Used to display output character strings
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Used to indicate text you should enter with your keyboard,
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exactly as printed
800TCU User's Guide
General Information
1
1-1

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Summary of Contents for TrueTime 800 Series

  • Page 1 General Information Scope of Manual This manual contains the information necessary to operate and maintain a TrueTime 800 Series Time Code Unit (TCU). This unit may contain Custom Options and/or Configurations. A description can be found starting on sheet iii of the index. This description may modify or supersede descriptions or specifications elsewhere in this manual.
  • Page 2 Purpose of Equipment Purpose of Equipment The Model 800 Series is a family of Time Code instruments designed around a versatile microprocessor. The three basic operating modes of these instruments are: 1. As a Time Code Generator that accumulates time from an entered starting time and then provides various outputs based on the accumulated time.
  • Page 3 Power Specifications General Information Power Specifications The input power specifications are: Voltage: 95 to 260 VAC Frequency: 47 Hz to 440 Hz Power: Approximately 15 Watts Option Identification Each of the options that are supplied with this unit are indicated in the Table of Contents by an (X).
  • Page 4 General Information Signal Specifications Internal Oscillator (TCXO) Frequency: 10 MHz Stability: < 0.5x10E , 0 to +50°C Aging: < 1 PPM/year Internal Oscillator (OCXO) Frequency: 10 MHz Stability: < 1x10E , 0 to +50°C Aging: < 2x10E /day External Time Base Input Frequency: 1 MHz Amplitude:...
  • Page 5 Signal Specifications General Information 1.8.2 Translator Specifications General Specifications, Translator Days Reset: Resets to day 1 after day 365 Leap Year: Resets to day 1 after day 366 on the day armed 0.5 µs, 1 µs, 10 µs, 100 µs, 1 ms, 10 ms, 100 ms, 500 ms Advance/Retard Rate: and 1 second Front-panel Controls and Indicators:...
  • Page 6 General Information Signal Specifications 1.8.3 Synchronized Generator Specifications General Specifications, Sync Generator Days Reset: Resets to day 1 after day 365 Leap Year: Resets to day 1 after day 366 on the day armed Phase Correction: Automatic, 500 ns corrections Front-panel Controls and Indicators: Operating Mode Translator Time and Generator Time...
  • Page 7 Standard Option Specifications General Information Propagation Delay Compensation µ Range: 0 to 99.999 ms in 1 s increments Error Bypass Frames: Selectable, 0 to 9 and infinite Timing Signals Rates: 1 kPPS, 100 PPS, 10 PPS & 1 PPS Duty Cycle: Amplitude: 0 to +5 VDC at ±6 mA Timing:...
  • Page 8 General Information Standard Option Specifications RS-232, Talker Only This interface supplies time only on demand. See Chapter 2 for complete programming information. The RS-232 specifications are: Data: Milliseconds through days Data Rate: 9600 baud Format: 1 start bit, 8 data bits, no parity, 1 stop bit Resolution: Generate Mode: 1 ms Sync Gen Mode: 1 ms...
  • Page 9 Standard Option Specifications General Information IRIG PB1 (Parallel Binary) Data: Nine bits of binary days, 27 bits of ms, time of day. Data rate: 1 kPPS Parity1: Odd for 27 bits of ms plus days Parity2: Odd for 27 bits of ms Data Ready Pulse: Active low pulse while data is changing.
  • Page 10 General Information Standard Option Specifications True Simultaneous Generator Mode The Generator continues output Generator Code even while the unit is in the Translator mode. Extended Baud Rate Range Data Rate: Selectable, 300, 600, 1200, 2400, 4800 and 9600 bps See Table 1-3 Transformer-coupled Input 600 Ω...
  • Page 11 Standard Option Specifications General Information 1.9.2 Pin Assignments Table 1-1 Parallel BCD Pin Assignments Pin Number Assignment Pin Number Assignment (1) [1] NOT USED (28) [10] TMC1 (2) [34] NOT USED (29) [43] TMC2 (3) [18] NOT USED (30) [27] TMC4 (4) [2] NOT USED...
  • Page 12 General Information Standard Option Specifications Table 1-2 IRIG PB1 Connector Pin Assignment Signal Signal DOY 2 EE 8 TOD 2 EE 10 DOY 2 EE 7 TOD 2 EE 9 DOY 2 EE 6 TOD 2 EE 8 DOY 2 EE 5 TOD 2 EE 7 DOY 2 EE 4 TOD 2 EE 6...
  • Page 13 By purchasing any product manufactured by TrueTime, the buyer consents to and agrees with TrueTime that as a result of the exclusion of all warranties, expressed or implied, of merchantability, fitness for purpose, or otherwise, except for the limited one-year...
  • Page 14 This document, whether patentable or non-patentable subject mater, embodies proprietary and confidential information and is the exclusive property of TrueTime, Inc. It may not be reproduced, used, or disclosed to others for any purpose except that for which it is purchased or loaned.
  • Page 15 Installation and Operation Introduction This section contains installation instructions and operating procedures. This unit may contain Custom Options and/or Configurations. If they exist, a description can be found starting on sheet iii of the index. A specifications or operational procedure found there supersedes any defined in Sections One or Two of this manual.
  • Page 16 Installation and Operation General Information and Operation This section describes operating procedures for the basic unit and many standard options. The options are noted by a (X) in the Table of Contents. If your particular unit does not contain one or more of the possible options, disregard references in this section that may apply to it.

  • Page 17: Filter Control

    Installation and Operation To change a parameter use the SETUP and ENTER keys in conjunction with the number keys. If the cursor is flashing and you wish to abort the change mode, press SETUP. The cursor will stop flashing and pressing a number key will change the prompt not the parameter. For Models 820 or 840 use the following example to select Positive Polarity mode and three frames of Error Bypass: •...
  • Page 18 Installation and Operation When the time has been properly entered, press the ENTER key to exit the change operation. Key 2: Selects the OPER STATUS display where various Generator/Translator diagnostic messages are displayed. The most common message is the error Time Valid Code display.
  • Page 19 Installation and Operation Key 4: Use to display or modify the Error Bypass or Advance/Retard parameters. Press the SETUP and ENTER simultaneously and a number key to modify the particular display in view. 1. ERROR BYPASS is the number of input code frames containing errors that will be ignored before they are loaded into the internal time registers.
  • Page 20 Installation and Operation simultaneously and any number keys to select the desired delay.The unit will synchronize to the input code and the time will be early with respect to the input code by the amount set into the Propagation Delay. Key 6: Selects the GENERATE CODE, TRANSLATE CODE and SYNC GEN REF CODE displays.
  • Page 21 Installation and Operation REV is used to start the Translator in the reverse direction. The REV indicator will be illuminated when the unit is in the reverse. START is used in the Generator mode to start the time accumulation. Pressing START will begin the count and the START indicator will be illuminated.
  • Page 22 Installation and Operation The time data is transmitted in ASCII in the following format: DDDHHMMSSmmm<LT> where is day of year is hours is minutes is seconds is milliseconds <LT> is the selected line terminator The time data is transmitted immediately after receipt of the Time command. The data is transmitted hundreds of days through milliseconds, followed by the line terminator if required.
  • Page 23 Installation and Operation is space (Hex 20) <CR> is carriage return (Hex OD) <LF> is line feed (Hex OA) The start bit for the carriage return character <CR> begins at the one second mark, +0 to +1 bit time. Time will continue to output once per second until the port receives another command.
  • Page 24 Installation and Operation Table 2-2 I/O Commands Name Commands AUTO TIME OUTPUT AU (RS-232 only) ERROR FILTER POLARITY ENABLE FORWARD TIME FREEZE GENERATOR CODE SELECT SYNC GEN INPUT CODE LINE TERMINATOR LT (RS-232) LEAP YEAR STATUS MODE PROPAGATION DELAY REVERSE START GENERATOR STOP GENERATOR TRANSLATE CODE SELECT...
  • Page 25 Installation and Operation Code Line Terminator none carriage return line feed carriage return and line feed AUTO TIME OUTPUT (AU) RS-232 command only. This command will place the unit in the automatic time output mode. Time-of-year will output once per second and continue until another command is received.
  • Page 26 Installation and Operation Example Write: EB00<CR> Select no Error Bypass FORWARD (FW) This command is used to place the Translator in the forward direction. Example Read: FW<CR> Translator is placed in the forward direction TIME FREEZE (FZ) This command will cause the 800 TCU to freeze its current time. The next TIME “TI” command will cause the time previously frozen to be returned.
  • Page 27 Installation and Operation SYNC GENERATOR INPUT CODE (IC) This command is used to return or load the Sync Generator input code selection. The response code returned will be one of the following: Response Code Time Code IRIG-B Example Read: IC<CR> Example Response: 2<LT>...
  • Page 28 Installation and Operation PROPAGATION DELAY (PD) This command is used to return or set the 800 TCU Propagation Delay. The format of the data is as follows: 12345 Character Data Tens Milliseconds Units Milliseconds Hundreds Microseconds Tens Microseconds Unit Microseconds Example Read: PD<CR>...
  • Page 29 Installation and Operation REVERSE (RV) This command is used to place the Translator in the reverse direction. Example: RV<CR> START GENERATOR (SG) This command may be used to start the Generator. Example: SG<CR> STOP GENERATOR/TRANSLATOR (ST) This command may be used to stop the Generator or Translator depending on the operational mode.
  • Page 30 Installation and Operation is hours is minutes is seconds is milliseconds <LT> is the selected line terminator In the Synchronized Generator and Translator modes, the time quality character will be an ASCII one (hex 31) if the unit has good reference code and an ASCII zero (hex 30). In the Generator mode the time quality character will always be an ASCII one character.
  • Page 31 I/O logic. The descriptions of the remaining boards depend upon a prior understanding of the processor board. TrueTime suggests reading the description of the processor board first. References to the "MPU" refer to the processor on the Processor Assembly unless otherwise specified.

  • Page 33: Maintenance

    Maintenance Introduction Effective maintenance and troubleshooting of this system requires a thorough understanding of equipment characteristics, operating procedures, theory of operation and knowledge of both linear and logic circuit elements. The equipment characteristics, operating procedures and the theory of operation for the system processor are provided in Chapter 1 through Chapter 3 of this manual.
  • Page 34 Maintenance General Information Disconnect equipment from the primary power prior to cleaning, inspecting, or disassembly. Dangerous voltages are present that can WARNING cause serious injury or loss of life. Cautions Exercise extreme care when handling this equipment. It contains precision parts that can be damaged by improper handling. Caution DO NOT TOUCH connector pin surfaces.
  • Page 35 Preventive Maintenance Maintenance Preventive Maintenance Preventive maintenance consists of a systematic routine that maintains maximum efficiency and reduces the possibility of a malfunction. This routine includes inspection, cleaning, and adjustment of the equipment. 4.3.1 Inspection This equipment consists primarily of solid state circuits that require no routine maintenance.
  • Page 36 Maintenance Corrective Maintenance 4.4.3 Visual Indicators Use the visual indicators, particularly the alphanumeric display, as a troubleshooting aid. Note any indications which vary from those which would normally be expected. The STATUS display gives error messages wherever possible. They may be useful in determining a failure mode.