This input is used by modems to signal an incoming call to the attached computer. The second RS232 test plug has the advantage that the ring-indicator RI input line can also be tested. The signal level on the DTR and RTS lines is also controlled by the test software and the attached inputs are read back in the software to see if these signal levels are properly returned. Data is sent on the Tx line and the received information on the Rx input is then compared with the original data. RS232 loopback test plug for Norton Diagnostics and CheckIt RS232 DB25 loopback connector (Norton/Checkit) DB9 Where the definition of RS232 focused on the connection of DTE, data terminal equipment (computers, printers, etc.) with DCE, data communication equipment (modems), MMJ was primarily defined for the connection of two DTE’s directly. Although this serial interface is differential (the receive and transmit have their own floating ground level which is not the case with regular RS232) it is possible to connect RS232 compatible devices with this interface because the voltage levels of the bit streams are in the same range. This type of connector has been used on systems built by Digital Equipment Corporation in the early days one of the leaders in the mainframe world. The pinout is also shown for the DEC modified modular jack. Note, that the protective ground is assigned to a pin at the large connector where the connector outside is used for that purpose with the DB9 connector version. The defined pins only present on the larger connector are shown in red. The diagrams show the signals common to both connector types in black. On personal computers, the smaller DB9 version is more commonly used today. It can be used to query the modem status while the modem is on-line and busy communicating. Also on a number of Telebit modem models the secondary channel is present. Examples of this are the Sun SparcStation 10 and 20 models and the Dec Alpha Multia. Only very few computers have been manufactured where both serial RS232 channels are implemented. In practice, only one serial communication channel with accompanying handshaking is present. In this DB25 connector pinout provisions were made for a secondary serial RS232 communication channel. The RS232 connector was originally developed to use 25 pins. These pages are intended to provide information about the most common serial RS232 cables in normal computer use, or in more common language “How do I connect devices and computers using RS232?” RS232 serial connector pin assignment All other pins are for modem control signal tests and are not necessary to connect unless you wish to test those signals.ĭB-9 RS-422, RS-485 Loopback Connection (Sealevel Product Specific)ĭB-25 RS-232 Loopback Connection (EIA-232)ĭB-25 RS-422, RS-485, RS-530 Loopback ConnectionAlmost nothing in computer interfacing is more confusing than selecting the right RS232 serial cable. Pins marked in red are the data lines, Tx and Rx, and are necessary for the loopback and BERT testing. Use the diagram appropriate to your electrical interface.ĭB-9 RS-232 Loopback Connection (TIA-574) If you want to test modem control signals or you need to construct your own loopback, follow the instructions below. Please contact your sales representative for more information. Item number LB102 is a DB-25 loopback that is used to test RS-232 serial ports. Item number LB101 is a DB-9 loopback that is specially constructed to test data signals on RS-232 and Sealevel RS-422, RS-485 serial ports. Additional loopback plugs can be purchased for a small charge. Sealevel serial I/O devices typically include a loopback plug with each shipment that can be used to test data lines.
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