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The GV-NET Card V3.1 is a RS-485 / RS-232 interface converter that can be installed inside a PC. It also supports connection via USB port.

Specifications
- OS Supported: 32-bit Windows XP / Windows Vista / Windows 7 / Windows Server 2008 - 64 bit Windows 7 / Windows Server 2008
- Interface: RJ-11 to DB9 (RS-232) / RJ-11 to USB / 3-pin internal USB to internal USB / RS-485+ / RS-485-
- Communication: RS-485 1,200~115,200 bps; USB
- Environmental Conditions: 0~50°C / 32~122°F, 5%~95% (non-condensing)
- Dimensions(W x H): 97 x 90 ( mm) / 3.82 x 3.54 (in)