master devices to a single Modbus network using RS485.
The dual converter receives messages from the Modbus masters.
The first message received is passed onto the RS485 network to
the slave module. After a reply from the slave is received, the
converter is ready to pass on the next message. If the converter
receives two messages from the masters at the same time, the
message from the master which transmitted first is passed on to
the network while the message from the second master is stored
in a buffer. This second message is sent once the previous reply
has been received.
The dual converter also provides isolation between the RS232 and
This prevents ground loops between the PC or PLC and network.