Microbee Systems MBS-GPS-SS2-5HZ Manual de usuario descargar pdf (Pagina 7)

Un-Inverted, I = Inverted.

RTS1 Inverts or un-inverts the RS-232 1PPS signal output. Bit set = invert.

DTR0 Inverts or un-inverts the TTL 1PPS signal output. Bit set = invert.

STATUS MONITORING

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Overview

Several status features are available. These are provided to monitor the 1PPS timing pulse

from either the GPS or the AUX 1PPS source. The 1PPS is primarily used for synchronization of

MicroBee Systems PC/104 FreeWave data radio products in Masterless TDMA mode and Push

To Talk (PTT) mode. In addition the 1PPS is very useful for timetag and system synchroniza-

tion functions by providing a very precise time mark. For these reasons advanced features

allow an AUX PPS, primarily for software development without a valid GPS signal, and polarity

inversion of the signals should a system/device require this.

Additionally the 1PPS output is available in both TTL and RS-232 Levels. Please refer to the

section on J6 for further information.

DSR0

of the Data Port monitors the GPS 1PPS or AUX before the 1PPS inversion capabilities. In

other words, this is direct from the GPS or AUX.

RI0

of the Data Port monitors the 1PPS before the inversion circuitry. Comparison of this BIT can

be used to help verify inversion is set.

RI1

of the Diff Port monitors the RS-232 1PPS after the inversion circuitry. If the 1PPS is non-

inverted then this will be identical to DSR0 & RI0. If inversion of the 1PPS is selected then this

will be the compliment of DSR0 & RI0.

CD0

of the Data Port monitors the TTL 1PPS after the inversion circuitry. If the 1PPS is non-inverted

then this will be identical to DSR0 & RI0. If inversion of the 1PPS is selected then this will be

the compliment of DSR0 & RI0.

CTS0

of the Data Port is used to monitor the AUX PPS in. If the AUX PPS is unused then this should

be ignored. This is used to monitor for the presence of an AUX PPS signal.

preliminary

REV B

1 2 3 4 5 6 7 8 9 10 11 12 ... 17 18

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Microbee Systems MBS-GPS-SS2-5HZ Manual de usuario Pagina 7

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