Cooper Instruments & Systems DFI 250X Digital Weight Indicator - Manual (Page 11)

CF 147 7 version 1.1
A temporary infrared communications link can be established between the instrument and a PC using an optional
GSE-LINK cable. The optional GSE-LINK cable can be used to transfer setup and calibration information from a PC
(e.g. to be stored for later use and/or transferred to other instruments). It can also be used to download software
upgrades to the instrument from a PC.
The PC end of the GSE-LINK cable is a standard female DB9 connector. The instrument end of the cable consists
of an infrared transceiver, which attaches to the left side of the instrument display. To facilitate a quick and simple
connection, the infrared transceiver is secured in place by a permanent magnet located within the head of the GSE-
LINK.
Refer to GSE-LINK Activation section 5.7.1 for more information.
WARNING
The GSE-LINK head contains a strong magnet and care should be taken with its proximity to electronic
media (e.g. credit cards, floppy disks, etc.) and/or other electronic instrumentation.
Figure 11: GSE-LINK Attachment
3.11 Connecting Shields
To obtain full EMC or for RFI immunity, cable shields MUST be connected to the earth lug on the rear of the
instrument.
Figure 12 illustrates an example of possible connections. Also shown are the connecting cables restrained using
cable ties fastened around the cable strain relief anchors.
Figure 12: Cable Shield Connection
3.11.1 Cable Shield Connection and Earthing
•
Care should be taken when connecting shields to maximize EMC or RFI immunity and minimize earth loops
and cross-talk (interference) between instruments.
•
For full EMC or for RFI immunity, termination of the cable shields at the earth lug is very important. The earth
lug of the instrument must be separately connected to ground potential via a reliable link.
•
The instrument should only be connected to earth via a single reliable link to avoid earth loops.
•
Where each instrument is separately earthed, interconnecting cable shields should be connected at one end