User Manual

7000 Bus Converter User’s Manual (Version 1.8 Jan/2006, 7PH-006-18) --------------- 11
2. I-7520/A/R/AR, PCISA-7520AR, PCISA-7520R
2.1 I-7520:
2.1.1 Pin Assignment and Specifications:
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 network
without repeater
• 2048 modules max in one RS-485 network with
repeater
• Isolation voltage: 3000V
• Isolation site: RS-232
• Repeater request: 4,000 feet or over 256
modules
• Power requirements: +10V dc ~ +30V dc
• Power consumption: 0.05A@24V; Max
2.1.2 Block Diagram