SMC Networks 486DX4 - Manual (Page 27)

AR-B1462 User¡ ¦s Guide
3-9
(E) RS-485 Mode Select (SW1-9 & SW1-10)
ON
1 2 3 4 5 6
OFF
SW1-9 & SW1-10 -- RS-485 MODE1
7 8
ON
1 2 3 4 5 6
OFF
7 8 10 9
10 9
SW1-9 & SW1-10 -- RS-485 MODE2
Figure 3-15 SW1-9 & SW1-10: RS-485 Mode Select
When RS-422 or RS-485 mode is selected, you also need to change M5 to select between RS-422 or RS-485
mode.
NOTE: 1. The recommended configuration for RS-485 interface is to set the transmitter to the controlled by DTR
and set the transmitter. Receiver is disabled.
2. The receiver is always enabled, so you will receive data that you transmitted previously. It is not
recommended to use this setting as RS-485 interface.
(2) RS-485/RS-422 Connector (CN15)
1 9 11 13 15 17 19 3 5 7
8 10 6 4 2 20 18 16 14 12
Figure 3-16 CN15: RS-485/RS-422 Connector
CN15 Signal CN15 Signal
1 -DCDAT 2 -DSRAT
3 RXDAT 4 -RTSAT
5 TXDAT 6 -CTSAT
7 -DTRAT 8 -RIAT
9 GND 10 VCC
11 GND 12 CTS+
13 RTS+ 14 CTS-
15 RTS- 16 RXD+
17 TXD+ 18 RXD-
19 TXD- 20 GND
Table 3-3 RS-485/RS-422 Pin Assignment