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7000 Bus Converter User Manual (version 1.2,Feb/2003, 7PH-006-10) --------------- 16
2.3 I-7520A:
2.3.1 Pin Assignment and Specifications:
2.3.2 Block Diagram:
7520A: RS-232 to RS-422/485 Converter
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Protocol: RS-422/485
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Connector: plug-in screw terminal block
•
Speed: “Self Tuner” inside, auto switching baud
rate, from 300 to 115200 BPS
•
256 modules max in one RS-485 network
without repeater
•
2048 modules max in one RS-485 network with
repeater
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Option jumper for 120 ohm termination resister
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Isolation voltage: 3000V
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Isolation site: RS-232
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Repeater request: 4,000 feet or over 256
modules
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Power requirements: +10V to +30VDCPower
consumption: 2.2W(Max)