5-10
Smartio
C168H/HS User’s Manual
RS-485 Cable Wiring for Opt8J
One RS-485 connection box designed for
Smartio
C168 Series is:
Opt8J:
Connection box with 8 female RS-422/485 DB25 ports. Set the port
switch to
ON
position (RS-485) for the desired port(s).
The Opt8J supports
only 2-wire half-duplex RS-485 communication
.
Data+/-
pins
are served for both data transmitting and receiving, depending on the RTS signal.
RS-485 Pinouts for Opt8J:
Opt8J
3
Data+(B)
7
GND
16
Data-(A)
Multidrop RS-485 Half-duplex
Point-to-Point RS-485 Half-duplex
Opt8J
RS-485 Device 1
Opt8J
RS-485 Device
Master
Slave
3 Data+(B)
Data+(B)
3
Data+(B)
Data+(B)
16 Data-(A)
Data-(A)
16 Data-(A)
Data-(A)
7 GND
GND
7
GND
GND
RS-485 Device N
Slave
Data+(B)
Data-(A)
GND
See Section
“RS-485 Programming”
of Chapter
“Serial Programming Tools”
for
more Opt8J RS-485 programming details.
3 Data+ (B)
Data-(A) 16
7 GND