The serial line present on OPDE / MiniOPDE drives has connection capability for “4-wire” data transmission
and therefore it can communicate in full-duplex mode. As a fact, by virtue of the protocol used
(MODBUS RTU), it always communicates in “half-duplex” mode, wherefore you can make the connection
with just “two wires” by connecting RX and TX and /RX and /TX between them.
In connector J1 (OPDE) / J3 (MiniOPDE), RX and /RX signals are the reception signals for the drive, while
TX and /TX are the transmission signals.
Impedances are fitted inside the drive to “terminate” the connection (120Ω) and polarize the line. To use this
terminal, connect between them terminals 5 - 3 and 9 - 7 of connector J1 (OPDE) / J3 (MiniOPDE) (for the
last drive in the line only).
Communication wires must be twisted.
4 LED DESCRIPTIONS