Signal Wirings - AXIOMTEK AX10445 Series User Manual

AX10445 Module Series User's Manual

2.5 Signal Wirings

RS -422 and RS -485 are new standards intended to succeed
the popular RS -232. RS -422 and RS -485 still preserve most
of the signals specified in RS -232. However the signal wirings
are different. The RS -422 interface is based on one-t o-one
principles, while the RS -485 interface is based on wire
sharing.
For the RS -422 interface, the cable must follow the
connection description below:
DTE 1
TX- 1
TX+ 2
RX+ 3
RX- 4
GND 5
RTS- 6
RTS+ 7
CTS+ 8
CTS- 9
For the RS -485 (two-wire mode) interface, the connection
des cription is as follows: (twisted wire drawings omitted)
12
DTE2
4
3 RX+
2 TX+
1
5
9
8
7
6
Setting up the AX10445
RX-
TX-
GND
CTS-
CTS+
RTS+
RTS-