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RS232 Interface

This interface was originally based on a 25 pin connector[1]. It defines:
RS232 pin definitions
The RS232 interface was designed to connect a modem (DCE) to a computer (DTE). To make a direct (DTE-DTE) link, a null modem cable (or null modem adapter) must normally be used.
 
[1] 9 pin connectors are also used, but there is no standard pin assignment for this -- the PC/AT pinout is the most common.
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