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3. Interface 3.1. RS-232C serial The PORTI-S printer has an RS-232C serial interface is connected by means of a 6 pin male connector. In the following table, the signals present on the connector are listed: (Fig.3.1) Pin no Signal Name Direction Function 1 GND - Ground 2 N.C - - ٻ 3 N.C - - ٻ 4 RxD Input Receive data ٻ 5 N.C - - ٻٻ 6 TxD Output Transmit data ٻ ٻ ٻ (Tab.3.1) ٻ ٻۈۊھډۈۄێۊۊےډےےےڊڊڕۋۏۏۃٻ ڔڌ