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)
7GND
16Data-(A)
| 7 GND |
Data-(A) 16 | 3 Data+ (B) |
|
| | 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.
5-10Smartio C168H/HS User’s Manual
