Key Specifications/Special Features: EX9188D：Support 4 RS232/RS485 devices COM1/4 Can be used to download program and can be RS232 port Watchdog support for system recovery "AutoPro" inside on RS485 port CPU：80188, 40MHZ SRAM：256KB/512KB FLASH ROM：512KB EEPROM：2KB EMBEDDED OS：MiniDOS 3000V Isolation option Advantech / ICP fully compatible Series：EX9188AD, EX9188BD, EX9188CD Model No. EX9523D EX9188E4D EX9527D EX9188E8D EX9188AD Ethernet  port x 10 BASE T x 10 BASE T x COM1 RS232/RS485 RS232/RS485 RS232/RS485 RS232/RS485 RS232/RS485 COM2 RS485(Isolate) RS485(Isolate) RS485(Isolate) RS485(Isolate) RS485(3000V Isolation) COM3 RS232(5wire) RS232(5wire) RS232(3wire) RS232(3wire) RS232(5wire) COM4 RS232(3wire) RS485 RS232(3wire) RS232(5wire)/RS485 Program download RS232(5wire) COM5 x x RS232(3wire) RS232(5wire)/RS485 x COM6 x x RS232(3wire) RS232(5wire)/RS485 x COM7 x x RS232(3wire) RS232(5wire)/RS485 x COM8 x x RS232(3wire) RS232(5wire)/RS485 x COM1：Program download RS232 (5wire) / RS485 (2wire) EX9188AD Program download from COM4   Main Export Markets: Worldwide