Installation and operator’s manual
Page 49 of 65
PVI-2000-OUTD-AU Rev.: 1.0)
6
DATA CHECK AND COMMUNICATION
6.1
RS-485 serial link
The RS-485 link uses two wires for signals plus a third wire for signal grounding,
which is different from the equipment grounding of the unit. The wires must be
run in a watertight conduit through the bottom of the unit as explained in
paragraph 3.5 after removing the watertight cap and installing a suitable watertight
conduit connector.
A gasket with 2 holes is supplied together with the watertight conduit (cable gland
PG16,5) in case multiple units are connected on the same RS485 link through a daisy
chain. In case a single wire is used please stop the 2
nd
hole with the small white plug
included in the kit.
The wires are then run to the RS-485 screw terminal blocks that is located in the
internal compartment and is accessible by removing the right side panel. Please refer
to paragraph 3.7 for further details on the correct procedure to remove and reposition
the side panel.
¾
Signal wires must be connected to +T/R and –T/R terminals
¾
Grounding wire must be connected to the RTN terminal
Fig. 16 RS-485 serial link terminal blocks
RT
N
RS485
ON
OFF
2
1
3
S1
+TR
-TR
TERMIN
Switch
Terminal Line