Sensaphone SCADA 3000 Users manual - Manual (Page 258)

24-4
SCADA 3000 User’s Manual
Address Jumper Code
1 A B B B
2 B A B B
3 A A B B
4 B B A B
5 A B A B
6 B A A B
7 A A A B
8 B B B A
9 A B B A
10 B A B A
11 A A B A
12 B B A A
13 A B A A
14 B A A A
15 A A A A
Figure 5: Setting the Bus Address
Bus Termination
Located on each module is a jumper labeled BUS TERM. This jumper is used to terminate
the 4-wire communications bus.
Figure 6: Bus Termination jumper
Termination is required at the extreme ends of the communications network to minimize
signal reflections that would otherwise cause data communication errors. To activate the Bus
Termination, move the jumper to the IN position. Note that this should only be activated if
the module is at the very end of the network. All other modules in between should have the
termination set to the OUT position. As a result, only 2 modules should ever have the termi-
nation activated. The diagram below illustrates proper termination of the communications bus.
Figure 7: Correct bus termination
Sensor/Transducer Wiring
Pulse sensors can be connected to the module using inexpensive 2-conductor cable as small as
#24 AWG. When connecting the module to dry contact sensors, polarity need not be observed.
Simply connect the sensor to the screw terminal pair for the selected input channel. The exam-
ple below shows a sensor connected to channel 1. When connecting the Pulse Count Module