Masterclock GPSPCI Spécifications télécharger pdf (Page 6)

GPSPC 2/17/2003 3 Masterclock, Inc.

DB-9 CONNECTIONS

Pin 1 - Pulse Out

TTL-level 100ms active low pulse generated once per second by the GPS receiver. The negative-going edge of the pulse is aligned with UTC

(Greenwich Mean Time) when the receiver has a 3-dimensional GPS satellite fix. This pulse is not available when the GPSPC is first powered

on. The pulse may become unavailable if the receiver loses GPS satellite fix for an extended period of time. Accuracy of this pulse (when

synchronized to GPS satellite) is nominally +/- 1us.

Pin 2 - RS-232 RX

RS-232 receive line.

Pin 3 - RS-232 TX

RS-232 transmit line.

Pin 4 - NC

No connect.

Pin 5 - Ground

Connect this pin to the ground of any host communicating to the GPSPC via RS-232.

Pin 6, 7, 8 and 9- NC

No connect.

COMMUNICATING VIA RS-232

The GPSPC supports a robust protocol for determining operation status. The following lists some of the

information available to the user:

• GPSPC status bits

• GPS receiver diagnostics

• GPS fix status and type

• UTC and generate time (including frame rate output)

• Enhanced time zone and daylight savings time configuration capability

The full GPSPC RS-232 protocol specification is available for download at the Masterclock, Inc. home page on

World Wide Web ( http://www.masterclock.com ). See the GPSPC section in the Downloadable Files area.

The jumper J1 on the GPSPCI card determines what device has control of the GPS module. If jumpered 1-2

(Factory Default), then the microcontroller on board has control of the GPS module. If jumpered 2-3, then a

serial device

connected to the DB-9 can control of the GPS module. In either case, the control information sent to the GPS

module is echoed on TP2. NOTE: If a serial device connected to the DB-9 is controlling the GPS module,

information from the card will be unavailable to the PC in which it is installed.

PRE-AMPLIFIED ANTENNA

The GPSPC requires a pre-amplified antenna. It provides 5 VDC via the center pin of the coaxial for remote

power. Warning: Attaching a passive (non pre-amplified) antenna to the GPSPC could destroy the GPS

receiver module. This is a major repair cost, which is not covered by warranty.

The unit is tested and shipped with the appropriate cable for the antenna that was ordered. Should you

require a longer antenna cable we recommend that you contact Masterclock so that a properly matched cable

and antenna can be supplied.

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