Coolsat Serial Cable

Posted on 30.09.2019by admin

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Serial Cable

Select the right RS232 null modem cable. In depth tutorial of all types of serial null modem cables. Includes easy to use selection table.

Nullmodem.Com Null Modem Cable After all, isn't this why you came to this site? The purpose of a null-modem cable is to permit two RS-232 'DTE' devices to communicate with each other without modems or other communication devices (i.e., 'DCE's) between them. To achieve this, the most obvious connection is that the TD signal of one device must be connected to the RD input of the other device (and vice versa). Also, however, many DTE devices use other RS-232 pins for out-of-band (i.e., 'hardware') flow control. One of the most common schemes is for the DTE (the PC) to assert the RTS signal if it is ready to receive data (yes, it DOES sound backwards, but that's how it works), and for the DCE (the modem) to assert CTS when it is able to accept data.

By connecting the RTS pin of one DTE to the CTS pin of the other DTE, we can simulate this handshake. Also, it is common convention for many DTE devices to assert the DTR signal when they are powered on, and for many DCE devices to assert the DSR signal when they are powered on, and to assert the CD signal when they are connected. By connecting the DTR signal of one DTE to both the CD and DSR inputs of the other DTE (and vice versa), we are able to trick each DTE into thinking that it is connected to a DCE that is powered up and online. As a general rule, the Ring Indicate (RI) signal is not passed through a null-modem connection. Common Null-Modem Connection Signal Name DB-25 Pin DB-9 Pin DB-9 Pin DB-25 Pin FG (Frame Ground) 1 - X - 1 FG TD (Transmit Data) 2 3 - 2 3 RD RD (Receive Data) 3 2 - 3 2 TD RTS (Request To Send) 4 7 - 8 5 CTS CTS (Clear To Send) 5 8 - 7 4 RTS SG (Signal Ground) 7 5 - 5 7 SG DSR (Data Set Ready) 6 6 - 4 20 DTR CD (Carrier Detect) 8 1 - 4 20 DTR DTR (Data Terminal Ready) 20 4 - 1 8 CD DTR (Data Terminal Ready) 20 4 - 6 6 DSR Here's another null-modem connection that I've seen floating around the net. Some folks say that it's the cable that's shipped with LapLink 4 Pro.

Signal Name DB-25 Pin DB-9 Pin DB-9 Pin DB-25 Pin FG (Frame Ground) 1 - X - 1 FG TD (Transmit Data) 2 3 - 2 3 RD RD (Receive Data) 3 2 - 3 2 TD RTS (Request To Send) 4 7 - 8 5 CTS CTS (Clear To Send) 5 8 - 7 4 RTS SG (Signal Ground) 7 5 - 5 7 SG DSR (Data Set Ready) 6 6 - 4 20 DTR DTR (Data Terminal Ready) 20 4 - 6 6 DSR Personally, I don't think that a null-modem cable built to the above pinout will work quite as well, but a lot of folks appear to have success with it. In general, it will work with some software packages, such as those that only use RTS/CTS hardware flow control. However, some packages that rely on the proper assertion of the CD signal will not work with this cable. Here's a good set of figures for DB-25 male and female connectors, as viewed from the pin side (not the solder side).

DB-25 Male DB-25 Female Here's a good set of figures for DB-9 male and female connectors, as viewed from the pin side (not the solder side). DB-9 Male DB-9 Female If you're using a serial cable or null-modem cable for local serial connectivity or for modem replacement, you might consider looking at the ™ network connectivity solutions. You can use Traversix ethernet-to-serial connectivity products to connect to serial-enabled devices over the Internet, even (especially) when those devices are located behind a third-party firewall. This page and its contents, copyright © 1996-2007,. Here's a link to our. If you have any questions about this page, please don't hesitate to e-mail me. (The address should be obvious to all but spam-bots.) This site last updated 7/11/2008.

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