ModBUS CONNECTION RULES
1) Install the modules in the DIN rail (120 max)
2) Connect the remote modules using cables of an appropriate length. The following table shows cable length data:
- Bus length: maximum length of the Modbus network according to the Baud Rate. This is the length of the cables
that connect the two farthest modules (see Diagram 1).
- Derivation length: maximum length of a derivation 2 m (see Diagram 1).
For maximum performance, it is recommended to use special shielded cables, such as BELDEN 9841.
INSTALLATION REGULATIONS
The module has been designed for vertical installation on a DIN 46277 rail. For optimal operation and long life,
adequate ventilation must be provided. Avoid positioning ducting or other objects that obstruct the ventilation slots.
Avoid mounting modules over heat-generating equipment. Installation in the bottom part of the electrical panel is
recommended.
Insertion in the DIN rail
As shown in figure:
1. Insert the IDC10 rear connector of the module on a free slot of
the DIN rail
(the insertion is univocal since the connectors are polarized).
2. To secure the module to the DIN rail, tighten the two hooks on
the side of the IDC10 rear connector.
USB PORT
The module is designed to arrange data according to the modes defined by the MODBUS protocol. It has a micro
USB connector on the front panel and can be configured using applications and/or software programs. The USB
communication has priority over the RS485 communication.
The USB serial port uses the following communication parameters:
2400,8,N,1
The USB communication port
responds exactly like the RS485 port with the exception of the communication parameters. During the use of the
USB port, the bus will be inactive; it will reactivate automatically a few seconds after the last message exchanged
on the USB port. EASY SETUP is the software to use for the configuration. For more information, visit www.sene-
ca.it/
products/z203-2
Check that the device in question is included in the list of products supported by the Easy Setup APP in the store.
6/8
CU-A-MICRO-
OTG
CU-A-MICROB
CU-A-MICROB
1200 m
2 m
2
1
4
5
Ld
Diagram 1
Bus length
Derivation
length
Module
Module
Module
Module
Module 3
Bus length
Ld= derivation length
Insertion on
the DIN rail
MODULE
DIN rail
Android APP
configuration
PC software
configuration
