DAB ESY I/O Guide Rapide page 25

Wiring
Modbus communication with 2-wire RS485 contemplates the use of 3 cables (A, B and GND). Connect the 3 cables correctly.
It is recommended to use a screened 2-pole cable, with a twisted pair, adapted to 120 ohm if termination resistors are to be used.
The typical connection with an RS485 BUS is shown below.
The recommended connection is always of the Daisy chain type (option 1). Do not use star (option 2) or ring connections. The termination
resistors, if necessary, must be inserted in the first and last device on the bus (e.g. Figure 11: The termination resistors must be inserted in
Master BMS and Device n) Figure 11: Examples of bus wiring.
The maximum recommended number of connected devices is 32, consistent with other devices in the network. The length of the cables
depends on the baud rate chosen, i.e. the higher the baud rate, the shorter the cable length.
Parameter configuration
Esy I/O parameters are configured via Dconnect APP, connecting point-to-point via smartphone.
ENGLISH
Figure 10: Rs485 Modbus Wiring
MODBUS Terminals
A
B
GND
Table 6: Description of Rs485 Terminals
Figure 11: Examples of bus wiring
22
Description
Terminal -
Terminal +
Reference