User's Guide ______________________________________________________________________
60 __________________________________________________________________ M210566EN-J
Stub
Termination Termination
Termination Termination
Junction box
Junction box
Junction box
Twisted pair
120R
120R
120R
120R
Twisted pair
Stub
Stub
Baud > 19.2K Stub < 10ft, 3m
Baud > 112K Stub < 1ft, 0.3m
Rx D0-
Rx D1+
Common
Tx D0-
Tx D1+
Switch
Term off
Term off
2/4wireon
RS422 off
Tx D0-
Tx D1+
Common
Rx D0-
Rx D1+
Switch
Term o ff
Term o ff
2/4 wire on
RS422 off
Tx D0-
Tx D1+
Common
Rx D0-
Rx D1+
5
4
3
2
1
RS485-1
RS485-1
Address MM
Address NN
RS485 bus master
5
4
3
2
1
1102-028
Figure 37 4-Wire RS-485 Bus
Table 7 4-Wire (Switch 3: On)
RS-485 master Data HMT330
Tx D1+ → Rx D1+
Tx D0- → Rx D0-
Rx D1+ ← Tx D1+
Rx D0- ← Tx D0-
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