Epson TM-U950P Specifications - Page 147

APPENDIX J: Bidirectional Parallel Interface J.1 Description The printer interface configured to the parallel interface specifications conforms to the IEEE-1284 Level-1 Devices and it works with those communication modes described in G.1.1 below. J.1.1 Parallel Interface Communcation Modes The parallel interface available with this product offers three communication modes as listed below. When the power is applied to the printer or the printer is reset, the initialization mode is Compatibility Mode. • Compatibility Mode This mode allows byte-by-byte data transmissions from the host to the printer. The normal data acception is proceeded in this mode. All the other modes are accessible through the Compatibility Mode. • Nibble Mode This mode allows data transmission from the printer to the host in units of four bits. Data transmissions from the printer are made via the status signal lines. To transmit one byte data in this mode, four bits data is transmitted twice in succession. • Byte Mode This mode allows data transmission from the priter to the host in units of byte. Data transmissions from the printer are made via the eight bits data signal lines. To enable the Byte Mode, the host must be capable of switching the direction of signals for the eight bits data signal lines. The communication direction from the host to the printer is referred to as Forward Mode, while the communication direction from the printer to the host is called Reverse Mode. TITLE EPSON TM-U950/U950P Specification (STANDARD) SHEET REVISION NO. NEXT A SHEET App.13 App.12