Microbee Systems MBS-GPS-SS2-5HZ Bedienungsanleitung PDF herunterladen (Seite 8)

NOTE

If AUX PPS is selected then the these features will work upon the AUX signal instead of the

GPS signal. The AUX is primarily used for software development of systems requiring a 1PPS

interrupt where no GPS signal is available as GPS systems may not provide a 1PPS without a

valid ﬁx.

TABLE 1

SIGNAL FUNCTION

STATUS LINE FUNCTION

DTR1 Reset Line for GPS or Ext device at J7

CD1 TTL Discreet input, active low, J6.4

DSR1 TTL Discreet input, active low, J6.5

CTS1 TTL Discreet input, active low, J6.6

DSR0 1PPS Presence monitor (source independent)

CTS0 Aux 1PPS Input monitor

RTS0 1PPS Source Selection, GPS or Aux In

RI0 1PPS Monitor (Always shows PPS source state)

RI1

1PPS RS-232 Post inversion circuit monitor (Shows if RS-232 PPS is

inverted or un-inverted.

CD0

1PPS TTL2 Post inversion circuit monitor (Shows if TTL PPS is inverted

or un-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.

PPS Active LED

The PPS LED ﬂashes when a PPS signal is valid from the GPS or the AUX PPS input. The

CPLD detects the rising edge of the PPS signal and turns on the LED until a counter expires.

Thus the LED ON duration is independent of the PPS Pulse Width.

preliminary

REV B

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Microbee Systems MBS-GPS-SS2-5HZ Bedienungsanleitung Seite 8