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3.3 Connector Pin-Out
The following is a functional description of each pin of the interface connector. The
pins are numbered from left to right as viewed from the connector end of the board with
the connector on top.
Pin 1:
TXD2 - Second Serial Asynchronous Output. Electrically identical to
TXD1. This output provides phase data (Ver 2.03) see Appendix D
Pin 2:
RXD2 - Second Serial Asynchronous Input. Electrically identical to
RXD1. This input may be used to receive serial differential GPS data
formatted per "RTCM Recommended Standards For Differential Navstar
GPS Service, Version 2.1" (see Section 4 for more details).
Pin 3:
PPS - One-Pulse-Per-Second Output. Typical voltage rise and fall times
are 300 nSec. Impedance is 250 ohms. Open circuit output voltage is 0V
and Vin. The default format is a 100 millisecond high pulse at a 1Hz rate,
the pulse width is programmable from a configuration command in
20msec increments. Rising edge is synchronized to the start of each
GPS second. This output will provide a nominal 700 mVp-p signal into a
50 Ohm load. The pulse time measured at the 50% voltage point will be
about 50 nSec earlier with a 50 Ohm load than with no load.
Pin 4:
TXD1 - First Serial Asynchronous Output. CMOS/TTL output levels vary
between 0V and Vin in the -LVC version.
versions a RS-232 compatible output driver is available. This output
normally provides serial data which is formatted per "NMEA 0183, Version
2.0". Switchable to 300, 600, 1200, 2400, 4800, 9600 or 19200 BAUD.
The default BAUD is 4800. This output data functions in parallel with pin
12.
PIN-OUT DIAGRAM
11
In the -LVS and -HVS
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