Epson 4000 Service Manual - Page 112
Supplements
UPC - 010343848337
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EPSON Stylus Pro 4000 1.6.4 Supplements RECEIVED BUFFER FULL OPERATION When data is received from the USB interface or the 1394 interface while no error has occurred (including the pause condition), the printer receives data a rate of 2 byte/second when free space of buffer is less than 16 KB. When buffer free space is more than 32Kbytes in order to prevent host timeout, the rate of byte/second receiving is cleared, and receiving is halted when free space reaches under 16 bytes, and returns to the rate of 2 byte/second receiving when free space reaches over 512 KB. NOTE: This status is not occurred in Type-B Level 3 Packet Mode for Credit administration. INTERFACE SELECTION The printer has IEEE1394 interface, USB 2.0 interface, and optional interface. These interfaces are selected manually by the default setting mode or selected automatically. Manual Selection One of 3 interfaces can be selected; IEEE1394 interface, USB 2.0 interface, optional interface. Automatic Selection Select an interface that the printer first received data after power was ON. If it passes period of time (10 seconds) after interruption of data receiving, it will be in idle status (any interface is not selected) and will select an interface which the printer next receives data first. NOTE: This status is not implemented in Type-B Level 3 Packet Mode for Channel administration. Interface Selection and Interface State When the printer is initialized or returned to the idle status (any interface is not selected), the USB interface becomes non-NACK reply status, and the option interface resets OFF-LINE bit of Main Status Register (MNSTS). INIT signal on the parallel interface is not effective while that interface is not selected or nibble Mode, ECP Mode. Product Description Interface Revision B 112