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7000 Bus Converter User Manual (version 1.2,Feb/2003, 7PH-006-10) --------------- 13
2. I-7520/A/R/AR, PCI-7520AR, PCISA-7520R
2.1 I-7520:
2.1.1 Pin Assignment and Specifications:
2.1.2 Block Diagram:
7520: RS-232 to RS-485 Converter
•
Protocol:
Differential 2-wire half-duplex RS-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
•
Option jumper for 120 ohm termination resister
•
Isolation voltage: 3000V
•
Isolation site: RS-232
•
Repeater request: 4,000 feet or over 256
modules
•
Power requirements: +10V to +30VDCPower
consumption: 2.2W(Max)