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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
• 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 networ
k
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 +30VDCPowe
r
consumption: 2.2W(Max)