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D-Series Syringe Pumps - Isco

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D <strong>Series</strong> <strong>Syringe</strong> <strong>Pumps</strong><br />

Section 6 Serial Interface<br />

Network Controller and Master Unit #0<br />

1R 5D[CR]<br />

Still no response.<br />

Network Controller and Master Unit #0<br />

1R 5D[CR]<br />

Still no response, so unit 1 will be dropped from the poll.<br />

Network Controller and Master Unit #0<br />

2R 5C[CR]<br />

Checks for unit 2 but will get no response in 200 ms<br />

because there is no unit 2.<br />

Network Controller and Master Unit #0<br />

2R 5C[CR]<br />

Still no response.<br />

Network Controller and Master Unit #0<br />

2R 5C[CR]<br />

Still no response, so unit 2 will be dropped from the poll.<br />

In this way units 3-5 will be checked and dropped from the poll.<br />

Network Controller and Master Unit #0<br />

6R 58[CR]<br />

Check for presence of unit 6.<br />

Unit 6<br />

R 8E[CR]<br />

Unit 6 responds.<br />

Network Controller and Master Unit #0<br />

7R 57[CR]<br />

Since unit 7 does not exist, it will be dropped from the<br />

polling scheme.<br />

Network Controller and Master Unit #0<br />

6R008IDENTIFY84[CR]<br />

The master verifies the fact that unit 6 is a Model ___D. In<br />

this example, the master and the network controller are a<br />

single unit. If they were separate units, the master would<br />

send the inquiry to the network controller; then the<br />

network controller would send the message to the slave<br />

unit the next time it is polled. The slave would respond<br />

with the message to the network controller. The next time<br />

the master is polled, the message would be relayed. The<br />

same sequence would occur with all messages. Since the<br />

master and the network controller are combined in this<br />

example, the relaying of messages is not necessary.<br />

6-9

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