Meinberg TCR511 User Manual
TCR511
Incl. Software TCRMON
Impressum
Meinberg Funkuhren GmbH & Co. KG
Auf der Landwehr 22
D-31812 Bad Pyrmont
Telefon: +49 (0) 52 81 / 9309-0
Telefax: +49 (0) 52 81 / 9309-30
Internet: http://www.meinberg.de
Email: info@meinberg.de
October, 30 2006
Table of contents
Impressum ............................................................................................ 2
Introduction .......................................................................................... 5
Description of IRIG-Codes................................................................... 5
IRIG-Standard format ........................................................................... 6
AFNOR-Standard format ..................................................................... 7
Overview.....................................................................................8
Function principle ................................................................................. 9
Setting into operation .......................................................................... 10
Supply Voltage..........................................................................10
Input Signals..............................................................................10
Input for unmodulated codes ..................................................... 10
Input for modulated codes ......................................................... 10
Input impedance ........................................................................ 11
Pulse and frequency outputs...................................................... 12
TIME_SYN-Output .................................................................. 12
Serial Ports ................................................................................ 12
Status LEDs .............................................................................. 12
Configuration of the board.................................................................. 13
Selecting the IRIG format..........................................................13
Baudrate and framing of the serial ports ............................................. 14
Output mode of the serial ports..................................................15
DCF Simulation.................................................................................. 16
Updating the Firmware ....................................................................... 17
Replacing the Lithium-Battery............................................................ 17
Technical Specifications TCR511 ...................................................... 18
CE-Label................................................................................... 19
Format of the Meinberg Standard Time String .......................... 21
Signals at Rear Connector .................................................................. 22
Rear Connector Pin Assignements ............................................ 23
Diskette with Windows Software TCRMON..................................... 25
The program TCRMON..................................................................... 26
Online Help............................................................................... 27
4
Introduction
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 TCR511 however only decodes IRIG-A, IRIG-B or AFNOR NFS
87-500 formats. The AFNOR code is a variant of the IRIG-B format. Within this code
the complete date is transmitted instead of the ‘Control Functions’ of the IRIG-telegram.
Description of IRIG-Codes
The specification of individual IRIG time code formats is defined in IRIG Standard 200-
98. They are described by an alphabetical character followed by a three-digit number
sequence. The following identification is taken from the IRIG Standard 200-98 (only the
codes relevant to TCR511 are listed):
character bit rate designation A 1000 pps
B 100 pps
1st digit form designation 0 DC Level Shift
width coded
1 sine wave carrier
amplitude modulated
2nd digit carrier resolution 0 no carrier (DC Level Shift)
1 100 Hz, 10 msec resolution
2 1 kHz, 1 msec resolution
3 10 kHz, 100 µsec resolution
3rd digit coded expressions 0 BCD, CF, SBS
1 BCD, CF
2 BCD
3 BCD, SBS
BCD: time of year, BCD-coded
CF: Control-Functions (user defined)
SBS: seconds of day since midnight (binary)
5
IRIG-Standard format
x 3x
IRIB-B : 1000 Hz
binary 0 binary 1
TYPICAL MODULATED CARRIER IRIG-A : 10000 Hz
6
AFNOR-Standard format
7
Overview
The Board TCR511 was designed for the decoding of unmodulated and modulated
IRIG- and AFNOR time codes. Modulated codes transport the time information by
modulating a sinusoidal carrier signals amplitude whereas unmodulated signals employ a
pulse width modulated DC signal.
The receivers automatic gain control allows the reception of signals within a range
from abt. 600mVpp up to 8Vpp. The potential free input can be jumper selectable
terminated in either 50Ω, 600Ω or 5kΩ. Modulated codes are applied to the board via an
on board SMB connector.
The unmodulated or 'DC Level Shift' time codes are applied via pins 21c and 22c of
the 64pin VG connector. Galvanic insulation of this input is obtained by an opto coupler
device.
TCR511 provides two configurable serial ports ( RS232 ), a pulse per minute and per
second ( PPS / PPM ) as well as a DCF Simulation port at TTL Level. Further three fixed
frequency outputs at 100kHz, 1MHz and 10MHz at TTL Level are available
The boards micro controller provides a Bootstrap-Loader that allows updating the
firmware stored in Flash-Memory via serial port COM0 by using the program
mbgflash.exe.
8
Function principle
After the received IRIG code has passed a consistency check, the software clock and
the battery backed real time clock of TCR511 are synchronized to the external time
reference. If an error in the IRIG telegram is detected, the boards system clock switches
into holdover mode.
Apart from the codes AFNOR NFS 87-500 and IEEE1344, IRIG codes do not carry a
complete date but the number of the day within the current year ( 1...366 ). Hence the
date that is output in the serial telegram must be completed by the date stored in the
buffered real time clock. The day within the current year calculated from the RTCs date
is compared with the day number from the IRIG code every minute. When a mismatch
between these two day numbers is detected the board signalizes freewheeling mode,
however the systems time base will continue to synchronize with the IRIG signal. The
DCF-Simulation is suppressed in this case.
Time and date of the real time clock can be set by a Meinberg Standard Telegram via
serial port COM0. Received IRIG-Time can be re-calculated into UTC provided that no
time zone changeovers such as daylight saving appear in the received IRIG telegrams.
For more information please see chapter 'UTC-Offset' in the online documentation of the
enclosed software TCRMON.
IRIG telegrams don’t include announcers for the change of time
zone (daylight saving on/off) or for the insertion of a leap second.
Hence the clock will switch into freewheeling mode in case of such
event, and resynchronize afterwards.
The board TCR511 decodes the following formats:
A133: 1000pps, amplitude modulated sine wave signal, 10 kHz carrier frequency
BCD time of year, SBS time of day
A132: 1000pps, amplitude modulated sine wave signal, 10 kHz carrier frequency
BCD time of year
A003: 1000pps, DC Level Shift pulse width coded, no carrier
BCD time of year, SBS time of day
A002: 1000pps, DC Level Shift pulse width coded, no carrier
BCD time of year
B123: 100pps, amplitude modulated sine wave signal, 1 kHz carrier frequency
BCD time of year, SBS time of day
B122: 100pps, amplitude modulated sine wave signal, 1 kHz carrier frequency
BCD time of year
B003: 100pps,DC Level Shift pulse width coded, no carrier
BCD time of year, SBS time of day
B002: 100pps, DC Level Shift pulse width coded, no carrier
BCD time of year
AFNOR NFS 87-500:100pps, amplitude modulated sine wave signal, 1 kHz carrier frequency
BCD time of year, complete date, SBS time of day
9
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