Preliminary Operations; General Information; General Points - socomec DIRIS A20 Instrucciones De Servicio

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,
• the product has not been damaged during transit,

GeNeral INfOrMatION

Functions
The optional Communication module must be connec-
ted to the DIRIS A20 (ref. 48250A20, 48250200,
48250A20UL). It provides an RS485 serial link (2 or
3 wires) with JBUS/MODBUS
DIRIS A20 from a PC or PLC.
Programmable
controllers
Other systems
Programmable
controllers
Other systems
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 shielded twisted
pair (type LIYCY-CY).
A repeater (1 channel) or an arrestor (4 channels)
should be used if you intend to exceed the distance
(1200 m) and/or maximum number (31) of DIRIS.
Please contact us for more information.
26 DIRIS A20 - Réf. : 536 085 C
®
• the product reference number conforms to your
• the package contains the product and the operating

General points

For a standard configuration, an RS 485 link is used to
connect up to 31 DIRIS A20 or COUNTIS Ci with a PC
or a PLC over a distance of 1500 metres, using JBUS/
protocol for the use of MODBUS
®
R = 120
1200 M
R = 120
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
order,
instructions.
protocol.
©
1200 M
N 1 N 2
0+- -+0
N 1 repetor
RS485
N n
R = 120
1200 M
N n
R = 120