CHAPTER 6
SIGNALS ON JI 15 PIN 'DS'
SIGNALS ON J4 15 PIN 'DP'
PIN
SIGNAL
PIN
SIGNAL
1
external 10 MHz input
1
RS-422 Rx(+)
2
ground
2
RS-422 Rx(-)
3
strobe output
3
RS-422 Tx(+)
4
1 PPS output
4
RS-422 Tx(-)
5
timecode output (AM)
5
ground
6
external event input
6
not used
7
timecode input
7
GPS 1PPS
8
timecode return
8
GPS RS-422 Rx(+)
9
oscillator control output
9
GPS RS-422 Rx(-)
10
not used
10
ground
11
timecode output (DCLS)
11
GPS RS-422 Tx(-)
12
ground
12
GPS RS-422 Tx(+)
13
1,5,10 MHz output
13
not used
14
external 1PPS input
14
ground
15
periodics output
15
GPS +12 VDC
INPUTS AND OUTPUTS
6.0 INPUTS AND OUTPUTS
Front panel I/O consists of an LED time and status display, a BNC timecode input, a BNC timecode
output, a 15 pin 'D' plug, and a 15 pin 'D' socket..
The current TFP time
hr:min:sec
is displayed using seven segment LED digits. I f the TFP is
flywheeling the digit decimal points are also illuminated. The time display is incremented at 990
milliseconds into the current frame. (One customer measured the LED radix point with a photo
diode and reported that it was indeed early!)
Timecode is input using BNC connector J3. Input amplitudes from 0.5 to 5 volts peak to peak are
accomodated. Timecode is output on BNC connector J2. The output amplitude is adjustable using
10 turn potentiometer VR1 located just below J2 and accessible with the TFP in place. The signals
on socket J1 and plug J4 are summarized in the table below.
1
Datum Inc., Bancomm Div.
bc635VME/bc350VX1 Manual
6
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