ESE ES-102, Operation And Maintenance Manual, Page: 2 / 22

Page 2
Date : The date information encoded into the "user bits" of the SMPTE time code is typically set to
include Month-Day-Year information. Turning “ON” the "DOY" DIP switch (switch #5 on the
ES-101 logic board) reformats the data to contain Day of Year (001-366) instead of Month-
Day-Year.
ESE Time Code : The most efficient and cost-effective method for time code distribution in a Master
Clock/Remote Clock System employs the ESE Time Code output. ESE Time Code is
capable of driving up to 100 remote displays at a distance of up to 4000 feet. Connections
(between the ES-102 ESE Time Code Output and any ESE Time Code Reader) can be
made using twisted pair wire or coax cable such as RG-58 or RG-59. The accuracy is 17mS
of UTC and the time code is accessible on two separate BNC connectors (TC89 & TC90).
TC89 is an older version of ESE Time Code and should be used to drive older ESE Time
Code Readers (non-”A” versions). TC90 contains “Date” information as well as time data
and should be used if “Date” is to be displayed on the Reader.
RS-232C : RS-232C ASCII Time Code is used to interface with a PC or other computer system. The
ASCII transmission contains date and time data and is transmitted once per second. The
data is accessible on the DB-9 connector. Windows

and DOS software included with the
unit enables the ES-102 to continuously update a computer’s clock. (Software is also
available from the ESE Web-Site at
http://www.ESE-WEB.com .)
GPS “Lock” : Access to a TTL output of GPS "Lock" information is accessible on the DB-9 connector.
When locked the signal goes to a logic “1”.
1PPS : The most accurate time information available from the ES-102 is that provided by the
1PPS Output (one pulse per second). Two (2) outputs are provided: a 20% duty signal
specified as being within 500ns of UTC, and a 50% duty signal which is within 1mS of UTC.
The 20% duty signal is obtained directly from the receiver. The 50% duty signal is
regenerated by the timekeeping microprocessor; this signal is isolated from dropouts due to
signal loss and should be used for long-term timekeeping purposes. Both signals are
positive edge true. The 1PPS can be used for synchronization purposes in a variety of
applications. One such application allows the 1PPS to drive an Impulse Driver (ES-165 or
ES-162A) which, in turn, can drive "Analog" Impulse Clocks (ES-168 or ES-162S).
Battery
The ES-102 has a lithium coin cell battery that maintains certain receiver configuration settings during power outages,
storage or shipment. The battery is capable of maintaining these settings for up to four years. All outputs, however,
are suspended during a power outage. If continuous outputs during power outages are required, a UPS
(Uninterruptable Power Supply) is suggested. Option “BBU” is available and is capable of maintaining power to all
outputs during a power outage for up to four hours.
Antenna
An "active" GPS Antenna (1.575 GHz) with 16’ 5” cable is supplied with the ES-102 and connects to the unit via a
TNC connector. ESE has conducted a series of tests with the purpose of determining a maximum cable length (with
or without amplification). A summary of the tests and the alternatives are discussed on page 8. Proper installation of
the antenna module is imperative for proper operation and continued life of the antenna and clock. See page 7.
Enclosure
The ES-102 is housed in a rack-mount enclosure that measures 1.75" high x 19" wide x 9.5" deep (plus connectors).
The ruggedized enclosure is constructed of etched and clear anodized aluminum.
SETUP FEATURES
Several features of the ES-102 are factory set according to information supplied by the end user or according to
factory standards. All Setup Features are selected via DIP switches except "Time Zone", "Time Delay/Advance" and
"Cable Delay". All Setup Features are discussed below.
Time Zone : The ES-102 receives GPS time and date information which has been encoded and set to UTC
(Universal Coordinated Time/Greenwich Mean Time). The unit must be set at the factory to decode
and output time for the end-user's time zone. Or, by using the software supplied with the ES-102,
the time-zone can be changed "in the field". This is accomplished by connecting the RS-232C input
to a computer serial port and running the ESEGPS (Windows

) or GPSINI.EXE (DOS) programs.
Running GPSINI.EXE without command line switches will print the instructions on screen. Run the
GPSINI.EXE program again using the appropriate command line parameters. Please connect
ONLY the 2 data lines & the ground line to the computer: the DB-9 connector also provides access