Serial tx rx gnd11/19/2022 Here, RS232 ports are used for several reasons: SCADA systems gather data from RTU’s (Remote Terminal Units) like controllers or meters, and then display the results on a PC. Typically they are used as programming ports to configure instruments and controllers, and are also used in SCADA (Supervisory Control and Data Acquisition) systems. RS232 Connection and ConfigurationĬonnecting a RS232 port to a laptop usually requires a RS232 to USB converter like our Define Multicom. However, RS232 ports remain in use today in the industrial sector. It remained in widespread use for serial communications between PCs, printers and other peripherals until the late 1990’s, after which it was superseded by USB. Once a standard feature on personal computers, the RS232 serial port was one of the first used to connect data terminals to mainframe computers. The particular requirements for different equipment may vary.Here we examine the history of the 3 serial interfaces used today and explore the common issues found with them and the benefits of each of the 3 different connections. When Handshaking is required, generally RTS of one device connects to CTS of the other, and vice versa, and also DSR of one device connects to DTR of the other device, and vice versa. The diagram below indicates how you would go about connecting two PC's together, without handshaking.Ĭonnecting two PCs together using RS232, without handshaking When the lines are handshake looped, the RTS output from the PC immediately activates the CTS input - so the PC effectively controls its own handshaking. The reliable solution is to loop back the handshake lines if they are not used. Depending on the signal state it might sometimes work, other times it might not. While the normal PC hardware might well run with just Tx, Rx and Ground connected, most driver software will wait forever for one of the handshaking lines to go to the correct level. Wiring up something nice and simple, for instance a plain old "dumb terminal", is just a matter of connecting Tx, Rx and Ground, right?
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