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Sensaphone SCADA 3000 Users manual User Manual

Page 258

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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