As only one instrument can transmit at a time. It is possible to connect all of the
transmit lines together, this does depend upon each unit being given a unique 'address'
or device number, a subject which is dealt with in the programming section of this
manual. It may be necessary to screen the communications wiring if installed in a very
noisy electrical environment. The screen should be grounded at one point only.
3.4.2 LINE TERMINATION
Termination resistors should be put on the receive inputs of the Host PC and the
instrument furthest away from it. This is shown schematically above.
The instrument has a 100 ohm termination on the comms board which may be
connected in-circuit by moving a user selectable link. The normal position, when the
unit leaves the factory is with the resistor disconnected.
COMMUNICATIONS
Page 23
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