Epson TM U200D Technical Reference - Page 30

Serial interface connection example Host Printer TXD DSR CTS RXD DTR FG SG RXD DTR RTS TXD DSR FG SG NOTES: t Set the handshaking so that the transmit data can be received. t Transmit data to the printer after turning on the power and initializing the printer. RS-485 Serial Interface (option) Refer to the Appendix for details. IEEE 1284 Parallel Interface Copyright (C) 1994 by the Institute of electrical and Electronic Engineers, Inc. Specification Data transmission: 8-bit parallel Synchronization: Externally supplied nStrobe signals Handshaking: nAck and Busy signals Signal levels: TTL compatible Connector: 57RE-40360-830B (DDK) or equivalent (IEEE 1284 Type B) Reverse communication (Printer Host): Nibble or Byte Mode Reverse Mode (Data Transmission from Printer to Host) The STATUS data transmission from the printer to the host is proceeded in the Nibble or Byte mode. This mode allows data transmission from the asynchronous printer under the control of the host. Data transmissions in the Nibble Mode are made via the existing control lines in unists of four bits (Nibble). In the Byte Mode, data transmissions are proceeded by making the eight-bit data lines bidirectional. 1-18 Features and General Specifications Rev.B