User Manual
Chapter 5 - Electrical Connections 29
5.4. The RS 485 serial interface
5.4.1. General
With DVS drives, an RS 485 serial line can be used to transmit data over a twisted pair cable made of two symmetrical
twisted wires with a common shield. Maximum data transmission speed is 38.4 KBaud.
Transmission uses a standard differential RS 485 signal (half-duplex).
Up to a maximum of 32 DVS drives can be connected in Multidrop configurations.
The JP7 serial line jumper
The RS 485 serial line is supported by terminals 15, 16 and 17 on the DVS drive control card.
The differential signal is transmitted to terminal 16 and terminal 17. To prevent interference, termination resistors [100 Ohm]
must be fitted at the beginning and end of the RS 485 serial lines physical connection cables.
RS232/
RS485
+V
CC
REGOLAZIONE
LINK +
LINK -
GND-D
PE
100
W
100
W
Schermo collegato
da un solo lato
REGOLAZIONE
REGOLAZIONE
N
OTA
!
When connecting and laying serial lines, make sure that the power cables are laid in separate
cable runways from the switchgear and relay cables.
Serial protocol
Serial protocol is set using the parameter
I.600
[
Serial link cfg
], which provides a choice of the following protocols:
FoxLink proprietary protocol, Modbus RTU (default) and Jbus protocols.
The device address on the serial line is set using the parameter
I.602
[
Device address
].
See section 7.1 (INTERFACE /Serial Configuration) later in this manual for further details about data transmission parameters,
protocols, ranges and values. See chapter 8 later in this manual for instructions on the use of Modbus RTU communication
protocol with DVS drives.
