Bristol 871A - Page 33

Model 871A User’s Manual MAKING MEASUREMENTS
Bristol Instruments, Inc. 33
Monitor Port
The Monitor Port on the rear panel of the 871 Laser Wavelength Meter provides the input
for a control trigger and monitoring of the data processing and output. The Monitor Port
uses a 9-pin, female, D-sub style connector shown in Figure 5.2 and with a pinout
described in the table below.
Figure 5.2: Monitor Port
Pin
Number
Signal Name
Signal Type
Description
1
N/C
2
N/C
3
TRIGGER
TTL
Input for external trigger signal.
4
N/C
5
GROUND
-
Circuit ground.
6
N/C
7
N/C
8
CALC
TTL
Monitor signal which is set high during the processing of
collected data. At the completion of data processing, results
are sent out the RS-422 port.
9
N/C