Both units have wide operating temperature range of -40ºC to 85ºC, automatic RS-485 data flow control, 3000VDC isolation protection, a surge protection RS-485 data line, transmission speed up to 115.2Kbps, networking up to 1,200 meters, reserved space for termination resistors, a power and data flow indicator for troubleshooting, and a power requirement of +10 to +30VDC with power reversal protection. Both units are designed to mount easily on a DIN-rail, panel or piggyback. Pricing on the ADAM-4510I and 4520I starts at $175 and $120 respectively.Advantech Corp, eAutomation Groupwww.eautomationpro.com/usPhone: 800.205.7940