Evco EPH4DXP1SA Manuale Utente Scaricare il pdf (Pagina 10)

EVCO S.p.A. c-pro 3 hecto MCSA | User manual ver. 2.0 | Code 144MCSAE204

page 10 of 52

The following tables illustrate the meaning of the connectors.

MODBUS

RS-485 port with Modbus slave communication protocol.

The following drawing illustrates the aspect of the RS-485 port.

The following table illustrates the meaning of the RS-485 port pins.

Meaning

1 common

2 not connected

3 not connected

4 D0 = B = - (terminal 0 of the transceiver)

5 D1 = A = + (terminal 1 of the transceiver)

6 not connected

7 not connected

8 not connected

The maximum length of the RS-485 port connection cables is 1,000 m (3,280 ft); see also Modbus specifications and

implementation guides Manual (the document is available on the website www.modbus.org).

MICRO-SWITCH

Micro-switch for:

- connecting the termination of the RS-485 port (120 Ω, 0.25 W); position micro switch 1 in the ON position in order to connect

the RS-485 port termination (connect the termination of the first and last network element termination).

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Evco EPH4DXP1SA Manuale Utente Pagina 10