Doc. nr. : 012257
Version:
V1.9
Date:
16-02-2011
VDH Products B.V.
Type:
MANUAL FC500-PC
Page:
21 of 43
RS485-NET communication connection:
Symbol
PCB
Cable
(colour)
Cable
mm
2
Terminal
Name
Description
B
Line-B
0,75
RS485-NET B
RS485-Network connection (Line-B)
A
Line-A
0,75
RS485-NET A
RS485-Network connection (Line-A)
0V Com.
0,75
RS485-NET
RS485-Network connection (0V com.)
Shield
-
Shield
Connect shield on one side to Earth
Use a 3-wire shielded 0,75mm
2
Cable. Connect Line-A to Line-A, Line-B to Line-B, 0V com. to
0V com. and Shield to Earth at one side of the cable, to the next unit.
Note:
The total RS485 cable length is maximum 1Km.
*)
The cable must be terminated at both cable-ends by a resistor of 250 Ohm between Line-
A and Line-B. When this unit is one of the cable ends this termination is provided by
placing a jumper on J2.
#)
At one point in the entire RS485-NET cable the pullup/pulldown jumpers (J13 and J14)
must be placed for signal conditioning.
Each unit on the RS485-network must have a unique network-number.
