Epson LQ-2550 User Manual - Page 249
Initialization, When the power is turned
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Handshaking Handshaking by DTR signal or X-on/X-off. The DTR signal changes to mark - meaning the printer is not ready to receive data - when the number of bytes free in the input buffer goes down to 256. The signal changes to space - meaning that the printer is now ready - when the number of bytes in the input buffer rises to 528. Error handling A * character is printed if a parity error is detected. All other errors are ignored. Connector D-sub 25-pin connector In this table, the direction of signals is given relative to the printer. Initialization There are the three ways that the printer can be initialized (returned to a fixed set of conditions). Hardware initialization l When the power is turned on l When the printer receives an INIT signal at the parallel interface (pin 31 goes LOW). Software initialization l Software sends the ESC @ (initialize the printer) command. Technical Specifications A-13