Signal converting system with standby mechanism and standby method

The invention relates to a signal converting system with a standby mechanism and a standby method. The method mainly comprises the following steps that: a signal converting device is used as a signal converting means between a control terminal computer and controlled remote equipment, wherein the control terminal computer is connected with the signal converting device through more than two network onlines; the control terminal computer virtualizes a virtual communication port connected with the remote equipment through a virtual communication port driver, and monitors the operation state of anetwork interface through a standby module in the driver; and when the standby module judges that the main online fails, the other standby online takes over the operation so as to provide more stableonline.