Preliminary Operations; General Information; General Points - socomec RS485 Instrucciones De Servicio

DIRIS A20 - RS485 - JBUS/MODBUS DIRIS A20 - RS485 - JBUS/MODBUS

prelIMINary OperatIONs

For personnel and product safety please read the
contents of these operating instructions carefully
before connecting.
Check the following points as soon as you receive the
Diris A 20 package:
• the packing is in good condition,

GeNeral INfOrMatION

Fonctions
The optional Communication module must be connec-
ted to the DIRIS A20 (ref. 485 0A0, 485 000,
4825 0A20UL). It provides an RS485 serial link (2 or
3 wires) with JBUS/MODBUS
DIRIS A20 from a PC or PLC.
PC
API
API
Recommendations:
You should use a shielded twisted pair (LIYCY type).
In a disturbed environment or large network (in
terms of length) we recommend the use of a shield-
ed twisted pair (type LIYCY-CY).
A repeater (1 channel) or an arrestor (4 channels)
should be used if you intend to exceed the dis-
tance (1200 m) and/or maximum number (31) of
DIRIS. Please contact us for more information. For
more information on how to make the connections,
14 DIRIS A20 - Réf. : 536 085 C
®
protocol for the use of
®
RS232
RS485 R=120Ω
PC
RS232
RS485 R=120Ω
®
• the product has not been damaged during transit,
• the product reference number conforms to your
order,
• the package contains the product and the operating
instructions.

General points

In a standard configuration, an RS485 link can be used
to connect 31 DIRIS or COUNTIS Ci units or any other
product communicating with a PC or PLC over a dis-
tance of 1500 metres and using the JBUS/MODBUS
protocol.
DIRIS DIRIS
COUNTIS ... COUNTIS ...
N 1
1200 M or 32UL
DIRIS
COUNTIS ...
N 1
R=120Ω + -
1200 M or 32UL
see the technical instructions available on the web-
site: www.socomec.com.
NB :
A 120 ohm resistance (found on the additional
module) must be fixed at both ends of the link.
Other solutions are available (modem, TCP-IP, optical
fibre, etc.). Please contact us.
DIRIS
COUNTIS ...
N 2 N n
Repeater
DIRIS
SOCOMEC
COUNTIS ...
N n
- + R=120Ω
1200 M or 32UL
®
R=120Ω
R=120Ω