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DIRIS Digiware - 542875G - SOCOMEC
EN
Notes:
• The order used when pressing the push buttons on the modules also determines the order for the Modbus addressing
of those modules.
•
Before launching the auto-discovery process, you can change the method to resolve address conflicts and set it to
AUTOMATIC. In this case, steps 3-5 are avoided
If you would like to assign specific Modbus addresses to the devices connected to the D-50/D-70 display, launch
the auto-discovery from the Easy Config System software, and change the Modbus addresses of slave devices
directly from the dashboard of the D-50/D-70 display (see 13.2).
11. COMMUNICATION
11.1. General information
The DIRIS Digiware system communicates via RS485 or Ethernet from the DIRIS Digiware M-50/M-70 gateway or
D-50/D-70 display, both acting as the unique point of access to measurements.
The M-50/M-70 and D-50/D-70 can communicate via multiple communication protocols: Modbus RTU, Modbus TCP,
BACnet IP, SNMP v1, v2, v3.
Maximum 32 devices can be visualised on the D-50/D-70 display or on WEBVIEW-M, the webserver embedded in the
M-70 gateway and D-70 display.
11.2. RS485 communication
The DIRIS Digiware C-31 module, DIRIS Digiware D-50/D-70/M-50/M-70 can communicate over RS485 (2- or 3-wire)
using the Modbus RTU protocol.
The Modbus protocol requires a dialogue with a master/slave structure. The mode of communication is the RTU (Remote
Terminal Unit). In a standard setup, an RS485 link enables the interconnection of 32 RS485 devices to a PC (with DIRIS
Digiware C-31 or DIRIS Digiware D-50/D-70 counting as one device), or a PLC over a distance of 1,200 metres.
Example of architecture using a C-31 module* :
U-xx
C-31
RS485
I-35
S-xx
Digiware bus
terminating resistor
Digiware Bus
* RS485 communication is also possible with M-50/M-70 gateways and D-50/D-70 displays
The following rules must be observed:
- A 120 Ω resistor must be added at the start of the RS485 link
- A 120 Ω resistor must be added at the end of the RS485 link
- A terminating resistor must be added at the end of the Digiware bus.
