Meinberg C600RS User manual

MANUAL
C600RS
RS232 interface
and internal power supply
24th October 2012
Meinberg Radio Clocks GmbH & Co. KG
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Front view (Frontansicht) C600RS
1 3
ENGLISH
1. Power
2. PZF Antenna input, BNC
3. Serial port, 25pin. D-SUB female
DEUTSCH
1. Stromversorgung
2. PZF Antenne Eingang, BNC
3. Serielle Schnittstelle, 25pol. D-SUB Buchse
114
13 25
2
C600RS DCF77 Funkuhr
vor dem Öffnen Netzstecker ziehen
!
Modulation
Feldstärke
Freilauf
Netz
Funkuhren GmbH & Co. KG
Lange Wand 9
D - 31812 Bad Pyrmont
www.meinberg.de
[email protected]
DCF77 Ant.
Pin 2 = RxD
Pin 7 = GND
Pin 9 = - pass. IN
Pin 12 = + pass. AUS
Pin 3 = TxD
Pin 11 = + 5V
Pin 10 = + pass. IN
Pin 13 = - pass. AUS
1 2
ENGLISH
1. Status LEDs: Modulation, Feldstärke, Freilauf, Netz
2. Pinbelegung 25pin. D-SUB female
DEUTSCH
1. Status LEDs: Modulation, Feldstärke, Freilauf, Netz
2. Pinbelegung 25pol. D-SUB Buchse
Side view (Seitenansicht) C600RS
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Page 0
Table of Contents
1 General Information about DCF77 1
2 C600RS 2
2.1 Overview................................................ 2
2.1.1 AntennaandLFReceiver................................... 2
2.1.2 MicroprocessorCircuit .................................... 2
2.1.3 BueredRealTimeClock................................... 2
2.1.4 AsynchronourSerialPort ................................... 2
2.2 Installation............................................... 3
2.2.1 Interfaces ........................................... 3
3 Technical Specifications C600RS 6
3.1 Format of the Meinberg Standard Time String . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2 Format of the Uni Erlangen String (NTP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.3 Format of the ATIS Time String . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.4 Format of the SYSPLEX-1 Time String . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.5 FormatoftheSATTimeString.................................... 13
3.6 Format of the Computime Time String . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.7 Format of the NMEA 0183 String (RMC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.8 Connectors............................................... 16
3.9 SUB-D 25 Connector Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.10LayoutC600RS ............................................ 18
3.11 Usage of the Current Loop Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.11.1 Active Output to Passive Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.11.2 Passive Output to Active Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4 Konformit¨ atserkl¨ arung / Declaration of Conformity 21
0 Date: 24th October 2012 C600RS
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Page 1
1 General Information about DCF77
The radio remote clocks made by Meinberg receive the signal from the long wave transmitter DCF77. This long
wave transmitter installed in Mainingen near Frankfurt/Germany transmits the reference time of the Federal
Republic of Germany. This time reference is either the Central European Time (Mitteleuropäische Zeit, MEZ) or
the Central European Summer Time (Mitteleuropäische Sommerzeit, MESZ). The transmitter is controlled by the
atomic clock plant at the Federal Physical Technical Institute (PTB) in Braunschweig/Germany and transmits
the current time of day, date of month and day of week in coded second pulses. Once every minute the complete
time information is available.
At the beginning of every second the amplitude of the high precision 77.5 kHz carrier frequency is lowered
by 75% for a period of 0.1 or 0.2 sec. The length of these time marks represent a binary coding scheme using the
short time mark for logical zeroes and the long time mark for logical ones. The infomation on the current date
and time as well as some parity and status bits can be decoded from the time marks of the 15th up to the 58th
second every minute. The absence of any time mark at the 59th second of a minute signals that a new minute
will begin with the next time mark.
Our radio remote clocks decode the highly accurate information on date and time within a wide range around
Germany. So some of our clocks are installed in Bibao/Spain as well as in the City of Umeå in northern Sweden -
fully statisfying the requirements of the users. The radio remote clocks automatically switch to summertime and
back. The reception of the time information is free of charge and does not need to be registered.
Gernerally it is important to position the antenna in an optimal way. It should be mounted at least 30 cen-
timeters away from the clock unit and from solid steel. The antenna should be aligned at a right angle to the
direction of the transmitter (Frankfurt).
0
10
20
30
40
50
R
M
1
4
2
1
0
2
10
8
4
2
1
P2
20
0
1
8
4
2
1
2
4
8
10
1
2
4
8
10
20
40
80
P3
A1
1
Z
Z2
A2
S
1
2
4
8
10
20
40
P1
Kodierung
nach Bedarf
Minute
Stunde
Kalendertag
Wochentag
Kalender-
monat
Kalenderjahr
M Minutenmarke (0.1 s)
R Aussendung über Reserveantenne
A1 Ankündigung Beginn/Ende der Sommerzeit
Z1, Z2 Zonenzeitbits
Z1, Z2 = 0, 1: Standardzeit (MEZ)
Z1, Z2 = 1, 0: Sommerzeit (MESZ)
A2 Ankündigung einer Schaltsekunde
S Startbit der codierten Zeitinformation
P1, P2, P3 gerade Paritätsbits
C600RS Date: 24th October 2012 1
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Page 2 2 C600RS
2 C600RS
The radio remote clocks C600RS has been designed for applications where only the serial interface is used to
transmit information on date and time to other devices. The clock has an enhanced LF receiver and is manufac-
tured using surface mounting technology (SMT). The elevtronic assembly is mounted in a plastic case with four
LEDs in the front panel which let the user monitor the clock's status.
2.1 Overview
2.1.1 Antenna and LF Receiver
An external ferrit antenna is used to receive the signal from DCF77. Optionally, a weather-proof antenna is
available which can be mounted outdoor. A coaxial cable which can be up to more than 100 meters in length is
used to pass the antenna's output signal to the on-board LF receiver where it is demodulated by a detector with
automatic gain control. The demodulated time marks are fed to the clock's microprocessor.
2.1.2 Microprocessor Circuit
Time marks from the receiver circuit are ltered and decoded by the microprocessor. If no errors are detected in
the current time message an additional plausibility check against the previous time message is performed. If that
plausibility check passes, too, the real time clock is read periodically and it's date and time are passed to the
serial port drivers. Additionally, the microprocessor generates output pulses when the second or minute changes.
An on-board microprocessor supervisory circuit provides a watchdog timer which resets the microprocessor if the
supply voltage drops below a specied threshold.
2.1.3 Buffered Real Time Clock
If the board's power supply is turned o, a gold cap capacitor on the board lets the real time clock keep time
and status for a minimum of 48 hours (typically 180 hours). This capacitor does not need any maintenance.
Alternatively, the clock can be ordered with a lithium battery which has 10 years of life time guaranteed.
2.1.4 Asynchronour Serial Port
Two asynchronous serial ports can be used to transmit information on date and time to other devices. The port
(COM 0) can be used as RS-232 port and (COM 1) as 20 mA current loop.
2 Date: 24th October 2012 C600RS
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2.2 Installation Page 3
2.2 Installation
The radio remote clock has a built in AC power supply. After the power cable has been connected, a green LED
labeled Netz indicates that the clock is ready to operate. If the antenna cable has been connected to both the
antenna and the clock's BNC connector, the brightness of the LED labeled Feldstärke reects the signal strength
of the 77.5 kHz carrier. In order to get the maximum signal, the antenna should be aligned in two steps. First it
should be turned slowly until the Feld LED is mostly dimmed. Finally the antenna must be turned by 90
◦
from
this position to obtain maximum signal. The antenna should be installed at least 30 cm away from the clock from
steel girders or plates.
If the antenna is installed properly and the signal from DCF77 can be received without strong distorions, the
green LED labeled Modulation starts blinking exactly once per second, corresponding to the time marks from
DCF77. If this LED ashes intermediately, there is some electrical noise around which prevents the microprocessor
from decoding the time message. In this case, a better location for the antenna must be found.
After reset, the red LED labeled Freilauf indicates that the clock is running on xtal and has not synchronized
with DCF77 yet. Due to the plausibility checks, it can take up to three minutes after power-up until the clock is
synchronized and this LED is turned o. The state of this LED only changes when a new minute begins.
The serial interfaces are operational immediately after switching on. The type of data transfer, framing and
baud rate can be adjusted by a monitor program.
2.2.1 Interfaces
Serial Ports
The asynchronous serial port can be congured by a DIL switch located inside the clock's case. When the clock
is beeing shipped, the levers of the DIL switch have been set to some defaults which are marked by asterisks in
the tables below. If one of the switch settings has to be changed, th upper party of the clock's case must be
removed by dataching the 4 screws located at the edges of the cover.
Serial Input and Output Drivers
The serial sting generated by the microprocessor is fed into a RS-232 output driver plus a 20mA current loop
driver in parallel. If the clock is congured to send time messages automatically once per second or once per
minute, both of the outputs may be used concurrently.
The serial input drivers need to be connected only if a serial string shall be sent on request. A Monitor pro-
gram lets the user select either RS-232 input or current loop input. It is not possible to use both the current loop
input and the RS-232 input together.
Both the current loop input and output can be wired for either active or passive operation. If a current loop driver
shall be operated in active mode, either - 15V must be supplied at the connector or the corresponding pin of the
port can be wired to ground. An example application at the end of this manual shows how to connect the port.
C600RS Date: 24th October 2012 3
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Page 4 2 C600RS
Transmission Speed
The transmission speed can be selected by the Monitor program. Any commonly used speed from 600 baud
through 19200 baud can be congured.
Output mode
The serial port sends a time string on request by incomming '?' character (ASCII code 3Fh). Additionally, a
time string can be generated automatically either whenever a new second starts or when a new minute begins. A
Monitorprogram are used to select the desired mode of operation:
Time Zone
A Monitorprogram lets the user select the clock's time zone. The serial string may either contain the Central Eu-
ropean Time rsp. Central European Summer Time (CET/CEST=MEZ/MESZ), or alway UTC (formerly GMT).
Pulse Outputs
Whenever a new second or minute starts, a corresponding pulse (P_SEC, P_MIN) with a width of 200 msec is
generated. These pulses are made available at the DB25 connector via optocoupler outputs. The P_SEC pulse
4 Date: 24th October 2012 C600RS
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2.2 Installation Page 5
is also available with RS-232 level (-3...12V/+3...12V). If required, Jumper JP2 must be set to activate this puls.
See the technical description and application example at the end of this manual for details.
C600RS Date: 24th October 2012 5
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Page 6 3 Technical Specications C600RS
3 Technical Specifications C600RS
RECEIVER: Synchronous demodulator with automatic gain control
bandwidth: approx. 50Hz
ANTENNA: Active external ferrite antenna in a plastic case
Length of the cable: up to more than 100m
RF AMPLITUDE,
MODULATION: Indicated by LED
TIMECODE
CHECK: Parity and consistency checking over a period of two minutes
RF distortions indicated by both LED and a status character in
the serial output string
Without RF signal the clock runs on XTAL
with an accuracy of 10-6
BATTERY
BACKUP: Gold Cap or Lithium battery
when the power is turned o, th on-board RTC keeps the time
based on XTAL for more than 48 hours (gold cap) rsp. more
than 10 years (lithium battery)
RELIABILITY OF
OPERATION: Microprocessor supervisory circiot provides watchdog timer,
power supply monitoring and backup-battery switchover
OUTPUT
PULSES: Optocoupler outputs (70V/20mA) provide pulses of 200msec
width whenever a new second rsp. minute begins.
P_SEC pulse with RS232-level (Jumper JP2 must be set)
ASYNCHRONOUS
SERIAL PORT: Transmission speed, framing, time zone and mode of operation
congurable by DIL switch
TRANSMISSION
SPEED: 600 through 19200 baud
FRAMING: 7E1, 7E2, 8N1 or 8N2
MODE OF
OPERATION: time sting transmitted automatically once per second, once per
minute, or when a request character '?' has been received
TIME ZONE: MEZ/MESZ=CET/CEST, or UTC
OUTPUT
STRING: see "Format of the Meinberg Standard Time String"
SERIAL LINE
DRIVERS: Output: RS232 and 20mA current loop (active or passive)
Input: RS232 or 20mA current loop (active or passive)
CONNECTORS: DB25 connector
6 Date: 24th October 2012 C600RS
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Page 7
coaxial RF connector (BNC type)
POWER
SUPPLY: 230V AC, 50Hz
-15V only when using 20mA current loop
PHYSICAL
DIMENSIONS: Rolec Technobox TBA084
L x B x H (160mm x 81mm x 62mm)
AMBIENT
TEMPERATURE: 0...50
◦
C
HUMIDITY: max. 85%
OPTIONS: Hardware and software modications accordding to customer
specication
This device conforms to the directive 2004/108/EC
on the approximation of the laws of the Member
States of the European Community relating to
electromagnetic compatibility.
C600RS Date: 24th October 2012 7
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Page 8 3 Technical Specications C600RS
3.1 Format of the Meinberg Standard Time String
The Meinberg Standard Time String is a sequence of 32 ASCII characters starting with the STX (start-of-text)
character and ending with the ETX (end-of-text) character. The format is:
<STX>D: dd.mm.yy;T:w;U:hh.mm.ss;uvxy <ETX>
The letters printed in italics are replaced by ASCII numbers whereas the other
characters are part of the time string. The groups of characters as dened below:
<STX> Start-Of-Text, ASCII Code 02h
sending with one bit accuracy at change of second
dd.mm.yy the current date:
dd day of month (01..31)
mm month (01..12)
yy year of
the century (00..99)
w the day of
the week (1..7, 1 = Monday)
hh.mm.ss the current time:
hh hours (00..23)
mm minutes (00..59)
ss seconds (00..59, or 60 while leap second)
uv clock status characters (depending on clock type):
u: `#' GPS: clock is running free (without exact synchr.)
PZF: time frame not synchronized
DCF77: clock has not synchronized after reset
` ` (space, 20h)
GPS: clock is synchronous (base accuracy is reached)
PZF: time frame is synchronized
DCF77: clock has synchronized after reset
v: `*' GPS: receiver has not checked its position
PZF/DCF77: clock currently runs on XTAL
` ` (space, 20h)
GPS: receiver has determined its position
PZF/DCF77: clock is syncronized with transmitter
x time zone indicator:
`U' UTC Universal Time Coordinated, formerly GMT
` ` MEZ European Standard Time, daylight saving disabled
`S' MESZ European Summertime, daylight saving enabled
y anouncement of discontinuity of time, enabled during last hour before discontinuity comes in eect:
`!' announcement of start or end of daylight saving time
`A' announcement of leap second insertion
` ` (space, 20h) nothing announced
<ETX> End-Of-Text, ASCII Code 03h
8 Date: 24th October 2012 C600RS
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3.2 Format of the Uni Erlangen String (NTP) Page 9
3.2 Format of the Uni Erlangen String (NTP)
The time string Uni Erlangen (NTP) of a GPS clock is a sequence of 66 ASCII characters starting with the STX
(start-of-text) character and ending with the ETX (end-of-text) character. The format is:
<STX> tt.mm.jj; w; hh:mm:ss; voo:oo; acdfg i;bbb.bbbbn lll.lllle hhhhm <ETX>
The letters printed in italics are replaced by ASCII numbers whereas the other characters are part
of the time string. The groups of characters as dened below:
<STX> Start-Of-Text, ASCII Code 02h
sending with one bit occuracy at change of second
dd.mm.yy the current date:
dd day of month (01..31)
mm month (01..12)
yy year of
the century (00..99)
w the day of
the week (1..7, 1 = Monday)
hh.mm.ss the current time:
hh hours (00..23)
mm minutes (00..59)
ss seconds (00..59, or 60 while leap second)
v sign of the oset of local timezone related to UTC
oo:oo oset of local timezone related to UTC in hours and minutes
ac clock status characters:
a: `#' clock has not synchronized after reset
` ` (space, 20h) clock has synchronized after reset
c: `*' GPS receiver has not checked its position
` ` (space, 20h) GPS receiver has determined its position
d time zone indicator:
`S' MESZ European Summertime, daylight saving enabled
` ` MEZ European Standard Time, daylight saving disabled
f anouncement of discontinuity of time, enabled during last hour
before discontinuity comes in eect:
`!' announcement of start or end of daylight saving time
` ` (space, 20h) nothing announced
g anouncement of discontinuity of time, enabled during last hour
before discontinuity comes in eect:
`A' announcement of leap second insertion
` ` (space, 20h) nothing announced
i leap second insertion
`L' leap second is actually inserted
(active only in 60th sec.)
` ` (space, 20h) no leap second is inserted
bbb.bbbb latitude of receiver position in degrees
leading signs are replaced by a space character (20h)
n latitude, the following characters are possible:
C600RS Date: 24th October 2012 9
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Page 10 3 Technical Specications C600RS
`N' north of equator
`S' south d. equator
lll.llll longitude of receiver position in degrees
leading signs are replaced by a space character (20h)
e longitude, the following characters are possible:
`E' east of Greenwich
`W' west of Greenwich
hhhh altitude above WGS84 ellipsoid in meters
leading signs are replaced by a space character (20h)
<ETX> End-Of-Text, ASCII Code 03h
10 Date: 24th October 2012 C600RS
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3.3 Format of the ATIS Time String Page 11
3.3 Format of the ATIS Time String
The ATIS standard Time String is a sequence of 23 ASCII characters terminated by a CR (Carriage Return)
character. The format is:
/GID//ABS//TSQ//CC//CS//ST/ jjmmtthhmmsswcc /GID//CR/
The letters printed in italics are replaced by ASCII numbers whereas the other
characters are part of the time string. The groups of characters as dened below:
GID Address of the receiver code 7Fh
ABS Originator of message ASCII '0' code 30h
TSQ Telegram number ASCII '0' code 30h
CC Command code ASCII 'S' for SET code 53h
CS Command code ASCII 'A' for ALL code 41h
ST Time status ASCII 'C' for valid time code 43h
yy.mm.dd. the current date:
yy year of the century (00..99)
mm month (01..12)
dd day of month (01..31)
hh.mm;ss.f die Zeit:
hh hours (00..23)
mm minutes (00..59)
ss seconds (00..59, oder 60 while leap second)
w the day of the week (1..7, 1=Monday)
cc checksum in hex, built from all characters including GID,ABS,TSQ,CC,ST,..
<CR> Carriage Return, ASCII Code 0Dh
(The standard interface conguration for this stiring type is 2400 baud, 7E1)
C600RS Date: 24th October 2012 11
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Page 12 3 Technical Specications C600RS
3.4 Format of the SYSPLEX-1 Time String
The SYSPLEX1 time string is a sequence of 16 ASCII characters starting with the SOH (Start of Header) ASCII
controll character and ending with the LF (line feed, ASCII Code 0Ah) character. The format is:
<SOH>ddd:hh:mm:ssq <CR><LF>
The letters printed in italics are replaced by ASCII numbers whereas the other
characters are part of the time string. The groups of characters as dened below:
<SOH> Start of Header (ASCII control character)
sending with one bit accuracy at change of second
ddd day of year (001..366)
hh:mm:ss the current time:
hh hours (00..23)
mm minutes (00..59)
ss seconds (00..59, or 60 while leap second)
q Quality
indicator (space) Time Sync (GPS lock)
(?) no Time Sync (GPS fail)
<CR> Carriage-return (ASCII code 0Dh)
<LF> Line-Feed (ASCII code 0Ah)
12 Date: 24th October 2012 C600RS
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3.5 Format of the SAT Time String Page 13
3.5 Format of the SAT Time String
The SAT Time String is a sequence of 29 ASCII characters starting with the STX (start-of-text) character and
ending with the ETX (end-of-text) character. The format is:
<STX> dd.mm.yy/w/hh:mm:ssxxxxuv <ETX>
The letters printed in italics are replaced by ASCII numbers whereas the other characters
are part of the time string. The groups of characters as dened below:
<STX> Start-Of-Text, ASCII Code 02h
sending with one bit accuracy at change of second
dd.mm.yy the current date:
dd day of month (01..31)
mm month (01..12)
yy year of the century (00..99)
w the day of the week (1..7, 1 = Monday)
hh:mm:ss the current time:
hh hours (00..23)
mm minutes (00..59)
ss seconds (00..59, or 60 while leap second)
xxxx time zone indicator:
`UTC` Universal Time Coordinated, formerly GMT
`MEZ` European Standard Time, daylight saving disabled
`MESZ' European Summertime, daylight saving enabled
u clock status characters:
`#' clock has not synchronized after reset
` ` (space, 20h) clock has synchronized after reset
v anouncement of discontinuity of time, enabled during last hour
before discontinuity comes in eect:
`!' announcement of start or end of daylight saving time
` ` (space, 20h) nothing announced
<CR> Carriage Return, ASCII Code 0Dh
<LF> Line Feed, ASCII Code 0Ah
<ETX> End-Of-Text, ASCII Code 03h
C600RS Date: 24th October 2012 13
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Page 14 3 Technical Specications C600RS
3.6 Format of the Computime Time String
The Computime time string is a sequence of 24 ASCII characters starting with the T character and ending with
the LF (line feed, ASCII Code 0Ah) character. The format is:
T: yy:mm:dd:ww:hh:mm:ss <CR><LF>
The letters printed in italics are replaced by ASCII numbers whereas the other
characters are part of the time string. The groups of characters as dened below:
T Start character
sending with one bit accuracy at change of second
yy:mm:dd the current date:
yy year of the century (00..99)
mm month (01..12)
dd day of month (01..31)
ww the day of the week (01..07, 01 = monday)
hh:mm:ss the current time:
hh hours (00..23)
mm minutes (00..59)
ss seconds (00..59, or 60 while leap second)
<CR> Carriage Return, ASCII Code 0Dh
<LF> Line Feed, ASCII Code 0Ah
14 Date: 24th October 2012 C600RS
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3.7 Format of the NMEA 0183 String (RMC) Page 15
3.7 Format of the NMEA 0183 String (RMC)
The NMEA String is a sequence of 65 ASCII characters starting with the `$GPRMC' character and ending with
the characters CR (carriage return) and LF (line-feed). The format is:
$GPRMC, hhmmss.ss,A,bbbb.bb,n,lllll.ll,e,0.0,0.0,ddmmyy,0.0,a*hh <CR><LF>
The letters printed in italics are replaced by ASCII numbers or letters where as the
other characters are part of the time string. The groups of characters as dened below:
$ Start character, ASCII Code 24h
sending with one bit accuracy at change of second
hhmmss.ss the current time:
hh hours (00..23)
mm minutes (00..59)
ss seconds (00..59, or 60 while leap second)
ss fractions
of seconds (1/10 ; 1/100)
A Status (A = time data valid)
(V = time data not valid)
bbbb.bb latitude of receiver position in degrees
leading signs are replaced by a space character (20h)
n latitude, the following characters are possible:
`N' north of equator
`S' south d. equator
lllll.ll longitude of receiver position in degrees
leading signs are replaced by a space character (20h)
e longitude, the following characters are possible:
`E' east of Greenwich
`W' west of Greenwich
ddmmyy the current date:
dd day of month (01..31)
mm month (01..12)
yy year of
the century (00..99)
a magnetic variation
hh checksum (EXOR over all characters except `$' and `*')
<CR> Carriage Return, ASCII Code 0Dh
<LF> Line Feed, ASCII Code 0Ah
C600RS Date: 24th October 2012 15
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Page 16 3 Technical Specications C600RS
3.8 Connectors
Name Type Signal Cable

Serial Interface 25pin SUB-D RS232 shielded data line
20mA
Pulse Outputs pulse per second pulse per minute
Antenna BNC 77.5kHz shielded coaxial line
(RG174/RG58)
Power supply receptable 230V / AC power supply cord
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