EVCO EPH4DXP1SA User Manual
Page 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.
Pin
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).