12
EN
COUNTIS E13 / E14 - 545 869 A - SOCOMEC
8. COMMUNICaTION
8.1. general information
The Modbus communication available on the COUNTIS E13/E14 communicates via an RS485 series link (2 or 3
wires) which is used to operate devices from a PC or an API.
In a standard configuration an RS485 connection is used to connect 32 products to a PC or a controller over 1200
metres.
+ - NC
N 1
+ - NC
N 2
+ - NC
N n
+ - NC
N 1
+ - NC NC - +
+ - NC
N n
Programmable
machines
Programmable
machines
Other systems
Other systems
Repeater
8.2. rs485 rules
A LIYCY shielded twisted pair must be used. We recommend using a shielded twisted pair with a general LIYCY-CY
shielding in an environment where there is interference or in a very long network with a number of products.
If the distance of 1200 m is exceeded and/or the number of products is greater than 32, a repeater must be added
to enable additional products to be connected.
A 120 Ohm resistor must be fixed at both ends of the connection.
