Evco EPH4EXP Hardware manual Manual de usuario descargar pdf (Pagina 27)

EVCO S.p.A. c-pro 3 | Hardware manual ver. 3.2 | Codice 114CP3E324

page 27 of 116

3 not connected

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

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

6 not connected

7 not connected

8 not connected

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

and implementation guides manual (the document is available on the internet site www.modbus.org).

Connect the RS-485 port using a twisted pair.

The following table shows the function codes supported by the controller.

Function

code

Meaning

FC 01 read coils

FC 02 read discrete inputs

FC 03 read multiple registers

FC 04 read input registers

FC 05 write single coil

FC 06 write single register

FC 08 diagnostic

FC 15 write multiple coils

FC 16 write multiple registers

FC 23 read write multiple registers

For the settings about the RS-485 port look at chapter 6 “CONFIGURATION”.

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Evco EPH4EXP Hardware manual Manual de usuario Pagina 27