AT International Group Co., Limited is a leading factory in China, specializing in RS232, PCI, USB, PCMCIA & Express GSM/GPRS/CDMA industrial modems, 3G HSDPA/HSUPA/EDGE modems and modem cards, PCI&RJ45 USB GSM/GPRS/CDMA 8/16/32/64 port modem pools, wireless communication parts and various cables for digital electronic products (GSM/CDMA Alarm systems). Our devices are in compliance with RS-232 and USB interface standards and have direct connectivity with RTU PLC. Intelligent instruments and other types of industrial devices are connected to next-bit machines, using a transparent means of communication, so non-ip system equipment through the serial ports is easy to access CDMA /GPRS network and Internet.