GPSPCI 2/72008 Rev 1.2.1
4
Masterclock, Inc.
Software application developers, may refer to the MCRPC-GPS ISA/PCI Bus Interface Protocol
Version 1.1.0 which is available for download from the support area of our website.
http://www.masterclock.com/data_files/mcrpc-gps-card-protocolV110.pdf
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 GPSPCI 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 nom/- 1
μ
s.
Pin 2 – NC
No connect.
Pin 3 – NMEA
NMEA Oututput , (RS-232 transmit signal from GPS)
Pin 4 - NC
No connect.
Pin 5 - Ground
Connect this pin to the ground of any host receiving NMEa information from the GPSPCI via RS-232.
Pin 6, 7, 8 and 9- NC
No connect.
RS-232 (NMEA MONITORING PORT)
•
The GPSPCI provides a monitoring port with NMEA 0183 output messages broadcast from
the GPS receiver available once per second, as a RS232 Level on Pin 3 of the DB9
connector. Pin 2 is not connected. Pin 5 is the signal reference/ground.
•
Standard NMEA 0183 broadcast messages include :
$GPRMC
$GPGGA
$GPGSV
•
Additional Proprietary Garmin GPS NMEA messages are included such as
$PGRMF
•
The monitoring port requires a null modem RS232 cable along with the following
communication port settings:
Bits per second: 9600
Data bits: 8
Parity: None
Stop bits: 1
Flow control: None
