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Installation
20
515 HC04 - 8 June 2007
Figure 13 RS-485 Interface Connections
Earthing and Shielding
It is a good practice to use shielded cable for all signal connections to the
instrument. Care must be taken to separate signal cables from power cables
to minimize interference.
Overall earth should be connected at the instrument end only. This
connection should be as short as possible and connected to the earthing
point on the rear terminal at pin 18.
Twisted Pair
Load
120 ohms
Gnd
Gnd
Host
Computer
Comms
Gnd
+
-
+
-
+
-
Instrument
Instrument
19 20 21
19 20 21
Содержание 515
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