| 摘要 |
<p>A paper handling optional unit detachably connected to a printer (1) comprises means (41, 42) for handling recording paper (S), means (42) for feeding the recording paper to the printer, communication means, having a first connector (71b), for communicating data via the first connector with the printer (1) and controlling means (102, 108) for controlling the operations of the paper handling optional unit in accordance with data received by said communication means via the first connector. The communication means has a second connector (72a) and is adapted to communicate data via the second connector with an other optional unit (50) detachably connected to the printer (1). When the other optional unit is connected to the printer, data received from the printer via the first connector are transmitted to the other optional unit via the second connector for controlling the operations of the other optional unit, and data received from the other optional unit via the second connector are transmitted to the printer via the first connector by means of the communication means. When the other optional unit is not connected to the printer data are returned to the printer via the first connector by means of returning means. <IMAGE></p> |
