Olson Technology LP-OR-304 - Manual (Page 9)

LPOR-304 Operating Instructions Revision A
4 June 2006 PAGE 9 of 10
OPTICAL POWER TEST POINTS
The unit has two analog test points on the front panel, labeled REC.1 (TP1) and REC.2 (TP2). These
voltages are generated by PWM outputs of the microprocessor. The scale factor is such that the test points
give 1 Volt/mW of input light. Note that the microprocessor takes into account the wavelength in
generating these voltages. The wavelength causes the responsivity to vary, changing the internal scaling
factor. Also note that these test points are in mW where other optical measurements mentioned herein are
in dBm. The step size for these outputs is approximately 33 µW.
TEST POINT SELECT SWITCH
This switch selects the RF monitor test point directly, not through the microprocessor. This switch
does not affect the output source of the unit. It has the same effect in redundant and independent modes.
I
2
C DISABLE LINES
There are two input lines from the I
2
C alarm circuit that are read at least twice per second. The inputs
and their function are as follows;
1) Alarm5 - This input (P2.2) determines if the Primary receiver is enabled. If Alarm5 is “OFF”, then
the Primary receiver is enabled. If Alarm5 is “1”, then the Primary receiver is disabled and the
Rx1 LED (D3) is turned off.
2) Alarm6 - This input (P2.3) determines if the Secondary receiver is enabled. If Alarm6 is “OFF”,
then the Secondary receiver is enabled. If Alarm6 is “1”, then the Secondary receiver is disabled
and the Rx2 LED (D4) is turned off.
SUMMARY ALARM RELAY
The P2.0 output of the microprocessor is used to drive a Summary Alarm Relay. When there are no
alarms and no receivers are disabled, this output should be a “OFF”. When there are any alarms and or
either receiver is disabled, this output should be a “1”.
Figure 5, page 10, shows a block diagram of all the microprocessor functions.
Table 7 – Test Point Select Switch Settings
POSITION TEST POINT SOURCE
UP Rx1 (primary)
DOWN Rx2 (secondary)