Epson 8900 Series Serial Communication Interface, Error Conditions, Communication Interfaces

Error Conditions

FAULT- and PE are printer status lines. The printer activates FAULT- to indicate a mechanism failure, such as a paper jam, and deactivates it when the error is corrected. After the paper supply is depleted, the printer activates both PE (paper empty) and FAULT- to indicate the paper-empty condition. Reloading paper causes the printer to deactivate the signals.

Activation of either FAULT- or PE also activates BUSY to indicate that the printer cannot receive data. If the host attempts to transfer a single character during this time, the byte remains on the interface data lines until the error condition is cleared. The printer neither prints the character nor activates ACK-. If the host attempts to send multiple characters during this time, the printer accepts only one character.

Note: The information in the following paragraph entitled “Serial Communication Interface” is valid for either the RS-232 or the RS-423 serial interface.

Serial Communication Interface

Your printer provides a 25-pin serial interface connector (shown in the following figure) at the rear of the printer. This connector carries both control and data information between the printer and the interface cable. The table on the following page lists the serial communication interface signals, their names, their interface connector pin assignments, and their sources.

13 12		11		10		9	8	7	6	5		4	3	2	1
25	24		23		22		21	20	19	18	17	16	15		14
serial interface connector
										Communication Interfaces 10-14