发表于:2005-07-13 18:19:00
5楼
您原本的系统应该是...
PC ==> RS-232 ==> RS-232 to RS-485 Converter ==> RS-485 device
那您可以用
PC ==> Virtual COM ==> Ethernet ==> Ethernet to RS-485 Converter ==> RS-485 device
如此, 您原来的程序就完全不用更改了, 只要将原来对 COM1/COM2 的存取, 改为 COMx 即可.
当然, 若您想用 TCP/IP 直接 access 也行.
PC ==> TCP/IP ==> Ethernet ==> Ethernet to RS-485 Converter ==> RS-485 device
I-7188E2D : 2端口RS-232/485串口设备联网服务器
http://www.icpdas.com.cn/products/products_detail.asp?pd_code=B03000I7188E2
I-7188E5D-485 : 5端口RS-232/485串口设备联网服务器
http://www.icpdas.com.cn/products/products_detail.asp?pd_code=B03000I7188E5-485