Meinberg TCG511 Manuale utente

Technical Information

Operating Instructions

TCG511

Timecode Generator

Impressum

Meinberg Funkuhren GmbH & Co. KG

Lange Wand 9

D-31812 Bad Pyrmont

Phone: +49 (0) 52 81 / 9309-0

Fax: +49 (0) 52 81 / 9309-30

Internet: http://www.meinberg.de

Email: [email protected]

December, 01th., 2009

Impressum ............................................................................................ 2

TIME CODE GENERATOR (TCG511) ............................................ 4

Abstract ....................................................................................... 4

Principle of Operation ................................................................. 4

Block diagram TCG511.............................................................. 5

IRIG standard format................................................................... 6

AFNOR-standard format............................................................. 7

Assignment of CF Segment in IEEE1344 mode ......................... 8

Generated timecodes ................................................................... 9

Setting TCG511 into operation ................................................. 11

Supply Voltage ................................................................ 11

Required inputs................................................................ 11

Configuration of the Board........................................................ 11

Configuration of serial port COM0 ........................................... 12

Selection of serial timestring ........................................... 12

Selection of generated time code ............................................... 12

Serial configuration of the board ............................................... 13

Outputs...................................................................................... 14

AM-sine wave-output ...................................................... 14

PWM-DC-outputs............................................................ 14

RS232-output................................................................... 14

Status-LED................................................................................ 15

Firmware Updates ..................................................................... 15

Technical data ........................................................................... 16

CE-Label................................................................................... 16

Time Strings .............................................................................. 17

Format of the Meinberg Standard Time String .......................... 17

Format of the Uni Erlangen String (NTP) ................................. 18

Signals at VG-connector ........................................................... 20

Table of Contents

TIME CODE GENERATOR (TCG511)

Abstract

The transmission of coded timing signals began to take on widespread importance in

the early 1950´s. Especially the US missile and space programs were the forces behind

the development of these time codes, which were used for the correlation of data. The

definition of time code formats was completely arbitrary and left to the individual ideas of

each design engineer. Hundreds of different time codes were formed, some of which

were standardized by the "Inter Range Instrumantation Group" (IRIG) in the early 60´s.

Except these "IRIG Time Codes" other formats, like NASA36, XR3 or 2137, are still

in use. The board TCG511 however generates the IRIG-A, IRIG-B IRIG-G, AFNOR

NFS 87-500 code as well as IEEE1344 code which is an IRIG-B123 coded extended by

information for time zone, leap second and date. If desired other formats are available.

Principle of Operation

The Board TCG511 was designed for the generation of IRIG, AFNOR and

IEEE1344 standard time codes. Particularly it is intended for operation with the Mein-

berg GPS radio clocks GPS161, GPS164 and GPS170 as well as the DCF77 correlation

receiver PZF511. Apart from the digitally generated amplitude-modulated code,

TCG511 also provides the unmodulated DC-Level shift code. The modulated sine wave

carrier and the boards internal time pattern are derived from the radio clocks disciplined

oscillator. For special applications, the board can be equipped with a freewheeling

oscillator ( OCXO or TCXO ). Signals needed for operation are a synchronuos pulse per

second signal (PPS), a serial time string at RS232 level, and a 10MHz reference clock as

mentioned above. After reading the serial timestring the IRIG code is phase-locked to the

precise pulse per second signal coming from the radio clock. TCR511 uses a special

software regulation to stabilize the internal time pattern. Bounces of the external PPS

signal less than +/- 300µs are corrected in steps of 1µs per second. In AFNOR-Mode the

output signal level is automatically set according to French-Std. NFS-87500.

Block diagram TCG511

RS232

drivers

RS232COM0

RS232COM1

microcontroller

modulator D/A converter

inverter

driver

50 unbalanced

drivers

TTL into 50

RS232 drivers

RS422 driver

transistor

digital

sinewave

generator

Flash EPROM

program

memory

EEPROM

data memory

dual

Tx/Rx

timecode

address/data/control

10 MHz modulated timecode

unmodulated timecodes

high- and low-active

unmodulated timecodes

high- and low-active

unmodulated timecode

PPS

IRIG standard format

x 3x

TYPICAL MODULATED CARRIER IRIG-A : 10000 Hz

IRIB-B : 1000 Hz

binary 0 binary 1

AFNOR-standard format

Assignment of CF Segment in IEEE1344 mode

Bit No. Designation Description

49 Position Identifier P5

50 Year BCD encoded 1

low nibble of BCD encoded year

51 Year BCD encoded 2

52 Year BCD encoded 4

53 Year BCD encoded 8

54 empty, always zero

55 Year BCD encoded 10

high nibble of BCD encoded year

56 Year BCD encoded 20

57 Year BCD encoded 40

58 Year BCD encoded 80

59 Position Identifier P6

60 LSP - Leap Second Pending set up to 59s before LS insertion

61 LS - Leap Second 0 = add leap second, 1 = delete leap second 1.)

62 DSP - Daylight Saving Pending set up to 59s before daylight saving changeover

63 DST - Daylight Saving Time set during daylight saving time

64 Timezone Offset Sign sign of TZ offset 0 = '+', 1 = '-'

65 TZ Offset binary encoded 1

Offset from IRIG time to UTC time.

Encoded IRIG time plus TZ Offset equals UTC

at all times !

66 TZ Offset binary encoded 2

67 TZ Offset binary encoded 4

68 TZ Offset binary encoded 8

69 Position Identifier P7

70 TZ Offset 0.5 hour set if additional half hour offset

71 TFOM Time figure of merit time figure of merit represents approximated

clock error. 2.)

0x00 = clock locked

0x0F = clock failed

72 TFOM Time figure of merit

73 TFOM Time figure of merit

74 TFOM Time figure of merit

75 PARITY parity on all preceding bits incl. IRIG-B time

1.) current firmware does not support deletion of leap seconds

2.) TFOM is cleared, when clock is synchronized first after power up. see chapter Selection of generated timecode

Generated timecodes

Besides the amplitude modulated sine wave signal, the board also provides unmodulated

DC-Level Shift outputs (TTL, RS232, RS422, open drain) in parallel. Thus ten time

codes are available.

a) A002: 1000pps, PWM-DC-Signal, no carrier

BCD time of year

b) A132: 1000pps, AM-Sine wave signal, 10 kHz carrier frequency

BCD time of year

c) A003: 1000pps, PWM-DC-Signal, no carrier

BCD time of year, SBS time of day

d) A133: 1000pps, AM-Sine wave signal, 10 kHz carrier frequency

BCD time of year, SBS time of day

e) B002: 100pps, PWM-DC-Signal, no carrier

BCD time of year

f) B122: 100pps, AM-Sine wave signal, 1 kHz carrier frequency

BCD time of year

e) B003: 100pps, PWM-DC-Signal, no carrier

BCD time of year, SBS time of day

f) B123: 100pps, AM-Sine wave signal, 1 kHz carrier frequency

BCD time of year, SBS time of day

g) B006: 100pps, PWM DC signal, no carrier

BCD time of year, year number ( 0...99 )

h) B126: 100pps, AM sine wave signal, 1 kHz carrier frequency

BCD time of year, year number ( 0...99 )

i) B007: 100pps, PWM DC signal, no carrier

BCD time of year, SBS time of day, year number ( 0...99 )

j) B127: 100pps, AM sine wave signal, 1 kHz carrier frequency

BCD time of year, SBS time of day, year number ( 0...99 )

k) G002: 10000pps, PWM DC signal, no carrier

BCD time of year

l) G142: 10000pps, AM sine wave signal, 100 kHz carrier frequency

BCD time of year

m) G006: 10000pps, PWM DC signal, no carrier

BCD time of year, BCD year

n) G146: 10000pps, AM sine wave signal, 100 kHz carrier frequency

BCD time of year, BCD year

o) AFNOR: Code according to NFS-87500, 100pps,

AM-Sine wave signal, 1kHz carrier frequency,

BCD time of year, complete date, SBS-Time of Day,

Signal level according to NFS-87500

p) IEEE1344: Code according to IEEE1344-1995, 100pps,

AM-Sine wave signal, 1kHz carrier frequency,

BCD-time of year, SBS time of day, IEEE1344

extensions for date, timezone, daylight-saving

and leap second in control functions ( CF ) segment.

also see table 'Assignment of CF segment in IEEE1344 mode'

Indice

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