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000409BG
5 - Installation
Table: crimping diagram for RJ45 connectors
Pin No. Function
1 8
3 +T/R
4 +R
5 -T/R
7 RTN
1, 2, 6, 8 not used
Use a connector with metal body to provide cable shield continuity!
For long distance connections, the connection on terminal connector is
preferable using a shielded twisted pair cable with characteristic impe-
dance of Z0=120 Ohm like the one shown on the following table:
Signal Symbol
-T/R
+T/R
RTN
-T/R
+T/R
RTN
LNK
LNK
Positive data +T/R
Negative datum -T/R
Reference RTN
Shield LNK
Shield continuity must be provided along the communication line using the LNK terminal and
must be grounded at a single point.
Procedure for connection to a monitoring system
Connect all the units of the RS485 chain in accordance with the “daisy-
chain” arrangement (“in-out”) observing the correspondence between
signals, and activate the termination resistance of the communication
line in the last element of the chain by switching switch
15
(to ON posi-
tion).
S2
120
TERM.
ON
OFF
15
Monitor
= OFF
15
= OFF
15
= ON
15
UNO
UNO
UNO
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