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Appendix B
B.8
B.8.1
DIP Switches
Single Modular Carrier C,D（HC801, HC803）
Set the module address and the terminal resistance on the module LocalBus by
change the DIP switches on the Single Modular Carrier C,D（HC801, HC803）.
1.
Setting module communication address fom 1 to 7 bits
Setting module communication address from 1 to 7 bits, range from 1 to 127.
According to preconcert setting of communication address binary value, when set one
bit of the DIP switch to “ON”, the corresponding binary value is “1”; when set one bit of
the DIP switch to “OFF”, the corresponding binary value is “0”. The low bit of the DIP
switch is corresponding to the low bit of the communication address binary value. The
corresponding relation of module communication address binary bit and the DIP switch
location is shown in Fig.B- 8 DIP Switches Settings of module communication address.
2.
Setting terminal resistance by the 8th bit
Terminal resisitors between the module’s local bus are required because of the data
transport quality. The head terminal resistor locate at the controller module carrier, and
the tail terminal resistor locate at the last I/O module on the local bus.
To enable the terminal resisitors, dial the 8th bit to “ON“ position.
See Fig.B- 8 DIP Switches Settings of module communication address.
Fig.B- 8 DIP Switches Settings of module communication address
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