DAB ESY I/O Instrucciones de instalación y mantenimiento - Página 13

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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

GND

Table 6: Description of Rs485 Terminals

Figure 11: Examples of bus wiring

Description

Terminal -

Terminal +

Reference