ADOS S.R.L. Buccinasco (MI)
1513-MPTB13ME
Rev. 0
Pag. 10 di 12
3.3.2 Serial
port
connection
Connections must be done with a shielded cable (RS232 lines) or with a twisted pair shielded cable
(RS 485 lines).
The cable must not be channelled with other cables (i.e. outputs connected to remote switches or
power supply wires), but must follow its own route.
The serial connection wire must be a maximum of 15 metres long (EIA RS-232-C standards) or
1000 metres in case of RS485.
RS232
In order to create the serial connection use a shielded cable, making sure that only one of the two
shield ends is grounded. If the cable has more conductors than those used, connect the free
conductors to the shield.
RS485
In the RS485 modality, put a 50
resistor in parallel (where necessary) to the signal of the unit that
is farthest from the HOST to correct for possible signal reflections.
CONNECTOR
PIN
FUNCTION
DATA
1
RS232 - RX
DATA 2
SIGNAL
GROUND
DATA 3
RS485
-
A
DATA
4
RS485 - B