Forma Scientific, Inc.
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2-4
•
Turn the nut until it is finger tight.
•
For reference, scribe the nut at the 6:00 position.
•
While holding the fitting body steady with a wrench, tighten the nut 1-1/4 turn until
the mark is at the 9:00 position.
•
Securely attach the CO2 line to the open end of the copper tubing.
•
Check the tubing connection for leaks.
2.6 RS-232 Interface and Remote Alarm Connector
The Model 3980/3986 is equipped with with an RS-232 Serial Communication Interface
for the remote transmission of temperature and humidity data. A remote alarm connector is also
included on the terminal strip.
Key
1 2 3 4 5 6 7 8 9
Pin
#
Description
1
2
3
4
5
6
7
8
9
temperature, Transmit Data
temperature, Receive Data
temperature, Common
humidity, Transmit Data
humidity, Receive Data
humidity, Common
temperature, Common
temperature N.O.
temperature N.C.
Terminal Pin Descriptions, RS-232 (1-6) and Remote Alarm Connector (7-9)
Figure 2-2