User Manual

7000 Bus Converter User’s Manual (Version 1.8 Jan/2006, 7PH-006-18) --------------- 12
2.2 I-7520R:
2.2.1 Pin Assignment and Specifications:
7520R: RS-232 to RS-485 Converter
• Protocol: two-wire RS-485, (D+, D-), protocol
• 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-485
• Repeater request: 4,000 feet or over 256
modules
• Power requirements: +10V dc ~ +30V dc
• Power consumption: 0.05A@24V; Max
2.2.2 Block Diagram: