1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
Terminator
220 ohms/0.5W
TX1
TX2
Max. 247 units can be linked
Shielded Twisted-Pair Wire
RS-485
TX1
TX2
PC
RS-232
RS-485 to RS-232
Network Adaptor
SNA10A or
SNA10B
TX1
TX2
DB9 Serial
Cable
Figure 4.12
RS-485 Wiring
10