ESE ES-185U, Operation And Maintenance Manual

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4.0 STANDARD FEATURES

4.1 Display

The front-panel display consists of nine .56" high yellow LEDs that display Days, Hours, Minutes and
Seconds. The display may be set to 12 hour or 24 hour format by using the Master Control Panel
software.

A single green LED indicates if the unit is "Locked" to GPS. Access to a TTL output of GPS "Lock"
information is accessible on the DB-9 connector.

4.2 Outputs

The rear-panel of the ES-185U provides access to all outputs via various connectors (XLR, BNC & DB-9).
Please refer to section 9 for more details.

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-185U 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.

1 PPS:

The most accurate time information available from the ES-185U is that provided by the 1
PPS Output (one pulse per second). Two (2) outputs are provided: a 20% duty signal
specified as being within 10 

η

S of UTC, and a 50% duty signal which is within 1 mS 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 1 PPS can be used for synchronization purposes in a variety of
applications. One such application allows the 1 PPS to drive an Impulse Driver (ES-165 or
ES-162A) which, in turn, can drive "Analog" Impulse Clocks (ES-168 or ES-162S and
Favags).

SMPTE Time Code:

A SMPTE Time Code Output is accessible via an XLR connector. The SMPTE Output is
automatically “resynced” to GPS after a specified number of frames, at a specified time or
both. The SMPTE Output can also be synchronized to a video source via the "Video In"
BNC connector. SMPTE (Society of Motion Picture and Television Engineers) is used
predominantly in the TV, Cable and Video industries. The unit may be set to EBU/PAL (the
European equivalent to SMPTE/NTSC) if desired. The SMPTE Date Format may be set to
one of four formats: Format L, Format E, Format S or DOY. Refer to section 5.3 for more
information about setting up the SMPTE Output.

IRIG-B Time Code:

An IRIG-B Output (AM or TTL) is accessible on a BNC connector. The IRIG-B output is
accurate to 1 

µ

S of UTC. An internal slide switch allows the user to set the output to AM or

TTL. IRIG-B (Inter Range Instrumentation Group) is needed most frequently for military
applications.

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.

USB:

The ES-185U provides a USB 2.0 compatible USB port. ASCII Time Code is output on the
USB port. 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. Refer
to section 9.0 for a description of the output format.

The USB port of the ES-185U acts as a virtual COM port when used to connect the
ES-185U to a computer. Refer to the computer’s Device Manager to determine the COM
port assigned to the ES-185U. Refer to section 5.0 for more information on installing the
USB driver.

The USB port is powered by the ES-185U. The maximum cable length is 5 meters. A 1.8
meter cable is provided with the unit.