4850 / 4860 Master Clock
Operating and Installation Instructions
Issue 2.0 7-1
Operation
The 4850 / 4860 Master Clock is fitted as standard with one
RS232 & RS485/RS422 serial data output. The signals are
accessed via the female DB9 connector labelled RS232/RS485
S1 mounted on the rear of the unit.
Additional serial outputs (4860.S2 & .S4 versions only)
The 4860 is optionally available with two or four RS232/RS485
serial data outputs. Where installed, these signals are
accessed via the S2, S3 and S4 female DB9 connectors. If your
4860 is fitted with multiple serial ports, extra serial setting
modes (S2, S3 & S4) will appear in the main programming
menu to allow these ports to be individually configured using
the procedure detailed below. (Please note: The RS232 level 1
pulse per second output is not present on pin1 of serial ports
S3 & S4).
Setting the Message Format
The 4850 / 4860 has 71 different preprogrammed serial output
messages. The desired message can be selected from the
lists on page 7-2 and programmed into the 4850 / 4860 using
the procedure on page 7-5. Please also refer to Appendix C for
details of products compatible with the 4850 / 4860.
Setting the Output Message Time Offset
The 4850 / 4860 serial output message may be referenced to
the current location setting (see section 4) or UTC/GMT as
detailed in the procedure on page 7-5 .
4850 / 4860 RS232 & RS485/422
Interface
DB9-F Connector
RS232
1 1PPS
2 Transmitted Data (TXD)
3 Received Data (RXD)
5 Signal Ground (GND)
RS485/422
8 ‘A’ - non-inverting
9 ‘B’ - inverting
Note:
The 1PPS signal is at RS232 levels and
goes high for 100ms on the second
edge.
Data Formats
The serial messages numbered from 01 to 09 are user
programmable. This allows the user to program information
concerning the baud rate, data bits, parity, stop bits and serial
repetition to ensure that the format chosen meets their
requirements.
Some of the other serial data messages have factory preset
transmission formats to ensure that system interconnection is
trouble free.
Message Format
Wharton Format 1 (Code 1)
STX Su St Mu Mt Hu Ht Du Dt Mtu Mtt Yu Yt St ETX
Wharton Format 2 (Code 4)
T Yt Yu : Mtt Mtu : Dt Du : 0 W : Ht Hu : Mt Mu : St Su CR LF
Byte Description ASCII value
S seconds 30h-39h
M minutes 30h-39h
H hours 30h-39h
W day-of-week 31h-37h
D day-of-month 30h-39h
Mt month 30h-39h
Y year 30h-39h
STX start transmission 02h
ETX end transmission 03h
CR carriage return 0dh
LF line feed 0ah
0 ASCII zero 30h
: ASCII colon 3ah
St status - see table 30h-3fh
Status byte - ASCII value 30h-3fh
Bit 0 undefined.
Bit 1 0 = Winter time, 1 = Summer Time
Bit 2 0 = not synchronised, 1 = synchronised
Bit 3 0 = no early warning bit, 1 = early warning bit
Application Notes
The 4850 / 4860 Information CD contains application notes
detailing the use of the 4850 / 4860 with many different types
of equipment. If you are unable to access the CD or require
further information on the setup and use of the serial output
please contact our technical support representatives.
The Serial Messages table on page 7.2 contains references to
application notes which contain additional information specific
to that serial message.
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.duab0021-21,duab0042-42,duab
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peRnoititepeRlaireS,cesyreveegassemlaires1-ES1
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,nim5yreveegassemlaires1-nn5
,ruohyreveegassemlaires1-rH1
,thgindiMtasrh42yreveegassemlaires1-rH42
,MA4tasrh42yreveegassemlaires1-nA4
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.ruohyrevetsapsnim51taegassemlaires1-51P
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7 - RS232 & RS422/485 Serial Output
RS232/RS485 S1
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