What is Hardware or RTS/CTS flow control?
Hardware or RTS/CTS flow control uses the RS-232 Request-To-Send (RTS) and Clear-To-Send (CTS) signals to pace the data stream. To successfully use RTS/CTS flow control, you must have the following: a modem cable with full modem controls, a correctly configured modem and some help from the operating system. In general, you should never attempt to use RTS/CTS flow control with a hardwired connection unless you have a special cable.RTS/CTS flow control is very reliable, if your equipment and operating system support it correctly. Most DOS/Windows machines do a good job of supporting hardware flow control. Some Unix machines are capable of supporting it while others are not. To work correctly, the serial port device driver must raise the RTS signal when it is ready to receive data. The modem must only transmit data to the serial port when the RTS signal is high. The modem must raise the CTS signal when it is ready to transmit data to the remote modem. The serial port device driver must on
