RS-232 interface (port 1)
The RS-232 standard defines the method of transferring binary single-ended data serially between DTE and DCE. Although the standard defines the electrical characteristics, timing and meaning of the signals, as well as the pinout of the connectors, it is applied in a multitude of slightly differing ways (e.g., different pin configurations). For this reason, different computers and peripherals are not necessarily directly compatible with each other.
The RS-232 standard defines transmission lines, in which each single signal line level is referenced to a common ground level. When connecting equipment using RS-232 interface, ensure that the equipment is connected sharing the same ground potential.
Major differences in ground potentials may result to large current flow in the ground (GND) wire and may lead to a malfunction or damage of the connected devices.
RS-232 has been designed for serial data transfer over short distances (usually less than 15 m).
