RS-232, when compared to later interfaces such as RS-422, RS-485 and Ethernet, has lower transmission speed, short maximum cable length, large voltage swing, large standard connectors, no multipoint capability and limited multidrop capability. The standard defines the electrical characteristics and timing of signals, the meaning of signals, and the physical size and pinout of connectors. PC serial port is based on RS-232 standard, you may find signals details in the RS-232 interface pinout.

The RS-232 standard had been commonly used in computer serial ports. It formally defines the signals connecting between a DTE (data terminal equipment) such as a computer terminal, and a DCE (data communication equipment), such as a modem.

Use the loopback test in the X-CTU software to determine that packets can be transmitted correctly.RS-232, is a standard introduced in 1960 for serial communication transmission of data. Remove the loopback adapter and attach the radio modem. Use the loopback test in the XCTU software to determine that packets can be transmitted correctly. When the adapters are assembled, test the cable by attaching the loopback plug into the yellow adapter and the CAT-5 cable, and the green one into the PC and the CAT-5 cable. (This cable will be carrying RS232 signals, not ethernet signals.) To build an 8-wire RS232/RS485 serial cable for use with the Nema-4 enclosure, use a standard CAT-5 networking cable to act as the extension between the computer and the radio modem. (This cable will be carrying RS232 signals, not ethernet signals.)Īssemble both the yellow and green adapter according to this table: To build a 3-wire RS232 serial cable ( 3-wire refers to the three signals: RXD, TXD and GND), use a standard CAT-5 networking cable to act as the extension between the computer and the radio modem. Wire color (Ethernet cable - EIA/TIA 568B )Īn example application for these adapters would be to extend the RS232 serial connection so that the radio modem might be located closer to the antenna location so that the antenna cable will be as short as possible. Two adapters are available:ĭB9 Male to RJ45 connector, Yellow adapter (p/n:JE1D2-CDA-A)ĭB9 Female to RJ45 connector, Green adapter (p/n:JE1D3-CDA-A) These adapters are shipped unassembled so that they may be put together to accommodate the needs of the application.

To facilitate adapting the DB9 connector interface to work with other physical connection types Digi offers RJ45 to DB9 adapters. The Digi radio modem has the RS232 and RS485/422 signals available on a DB9 connector. In some situations it is necessary to interface the RS232 or RS485 signals to RJ45, terminal strips or other physical connections.

Db9 serial pinout