UNO-2050E User Manual
34
RS-485 Signal Wiring
The RS-485 standard supports half-duplex communication. This means
that just two wires are needed to both transmit and receive data. Hand-
shaking signals (such as RTS, Request To Send) in RS-232 are normally
used to control the direction of the data flow and to switch the transmis-
sion accordingly. In RS-485 mode, the UNO-2050E automatically senses
the direction of the data flow and switches the transmission direction - no
handshaking is necessary. This means a user can build an RS-485 net-
work with just two wires. This RS-485 control is completely transparent
to the user. The software written for half duplex RS-232 works without
the need for any modification.
Figure A.3: RS-485 Wiring Topology
A.4 Ethernet RJ-45 Connector (LAN1~LAN2)
Ethernet RJ-45 Connector Pin Assignments
Table A.7: Ethernet RJ-45 Connector Pin Assigns
Pin
10/100Base-T Signal Name
1
XMT+
2
XMT-
3
RCV+
4
NC
5
NC
6
RCV-
7
NC
8
NC
