Technical Manual

2
The RS458 communication use half-duplexes communication, there
are no more than 32 QS series fingerprint attendance devices in an
attendance network.
The device RS485 connector is a RJ11 plug port; RJ11 plug port
front illustration and signal definition are following:
Some RS232/485 transducer have four label TX+, TX-, RX+, RX-
connector terminal, there are only two connector terminals in .the
equipment, because we join the TX+ and TX-signal, RX+ and TX-signal,
while we connect with this transducer, it is necessary to join TX+ and
RX+ terminal which connect RS485+, and to join TX- and RX- terminal
which connnect RS485-, so that communication is successful.
PC
RS 232/485
transducer
RS485+
RS485-
RS485+ RS485-
Number 1
RS485+ RS485-
Number N
1 2 3 4
RS485-
RS485+