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Figure 1-3. RS-422 Point-to-Point Serial Connection to Series 90-70 PLC..................................................1-2
Figure 1-4. RS-422 Point-to-Point Serial Connection to Series 90-30 PLC..................................................1-2
Figure 1-5. Point-to-Point Modem Serial Link Connection for Series 90 PLCs ...........................................1-2
Figure 1-6. Multidrop Serial Link Connection for Series 90 PLCs ...............................................................1-3
Figure 1-7. Multidrop System Using RS-422 Isolated Repeater/RS-232 Converter .....................................1-4
Figure 1-8. SNP Attach Sequence with a Series 90 PLC...............................................................................1-9
Figure 1-9. SNP Service Request to the PLC via Mailbox Message ...........................................................1-10
Figure A-1. Series 90 PLC, RS-422 Serial Port Connector Configuration..................................................A-4
Figure A-2. Workmaster RS-232 Serial Port Connector Configuration ......................................................A-6
Figure A-3. IBM-AT/XT Serial Port ...........................................................................................................A-7
Figure A-4. RS-232 to RS-422 Converter Logic Diagram ..........................................................................A-8
Figure A-5. Example RS-232 to RS-422 Converter Connection.................................................................A-9
Figure A-6. The Isolated/Repeater Converter............................................................................................A-11
Figure A-7. RS-422 IsolatedRepeater/RS-232 Converter Logic Diagram ................................................A-12
Figure A-8. Simple System Configuration Using the Isolated Repeater/Converter ..................................A